Animal Spotlight: Gasparinisaura

Gasparinisaura is just one of those many dinosaurs that are not very famous at all, and not very well known.  In fact, I hadn't even heard of it until this morning, when my episode of Dr. Who made the computer momentarily freeze, so I picked up my Jurassic Park Institue: Dinosaur Field Guide by Dr. Thomas R. Holtz and Dr. Michael Brett-Surman that was sitting next to me on the computer table and turned to page 74.  Learn something new every day!

Gasparinisaura is considered to be a part of the basal, or primitive, ornithopods.  Ornithopods are different from other ornithischian dinosaurs in that they have a premaxilla bone that reaches further than their maxilla bone, and that their jaw joint is further down than in other dinosaurs.  Most of the basal ornithopods were around during the Jurassic Period, such as the Late Jurassic Othnielia rex, who inhabited what would become the rocks of the Morrison Formation of Colorado, Utah, and Wyoming.  Most of the rest of the basal ornithopods didn't survive past the Early Cretaceous Period, but Gasparinisaura has been found in rocks dating from around 80-90 MYA, right smack-dab in the Middle Cretaceous Period of Argentina.  According to the Jurassic Park Institute, "Remains of dinosaurs from this time span are so extremely rare, all the specimens in the world would fit in one small exhibit hall!"

Let's take a brief look at what we know about the evolution and the dispersal of the basal ornithopods, shall we?  According to my massive, 861 page book called The Dinosauria, every member of the clade Ornithopoda (which includes the iguanodonts and the duck-billed hadrosaurs, as well as the basal ornithopods) had a common ancestor that came from Asia.  This is interesting to note, because two other major clades of dinosaurs, the Marginocephalians (which includes the ceratopsians like Triceratops and the Pachycephalosaurs like Pachycephalosaurus and Stygimoloch) and the Thyreophorans (which includes stegosaurs like Stegosaurus and ankylosaurs like Ankylosaurus [yes, I know, that sounded incredibly redundant]) are hypothesized to have originally evolved in Asia, before spreading out to other parts of the world.  Whew, that would have been a mouth-full if I had had to say that out loud.

Anyways, paleontologists believe that this common ancestor would have inhabited Asia during the Early Jurassic Period, or perhaps even before that.  According to the book, prior to the Late Jurassic, a "major dispersal to North America took place."  Following this dispersal to North America, two "subsequent dispersals from North America" followed, one to Europe, and the other to South America.  (Keep in mind that, at this time in Earth's history, the continents were intermittently connected, allowing for the over-land dispersal of animals that would be entirely unable to do the same thing today.)  The European dispersal contained ornithopods of the lineage that would one day lead to the relatively famous dinosaur known as Hypsilophodon.  This dispersal is thought to have occurred before or during the Early Cretaceous.  Meanwhile, the South American dispersal "took place (at the latest) during the early Late Cretaceous," and was composed of members of the lineage that would one day lead to our home-dawg, Gasparinisaura.  Boy, am I the only one who just skimmed those last two paragraphs?

Gasparinisaura, like many of the basal-most members of the ornithopods, was just a little guy, only around two feet long, and probably weighing about as much as a chicken.  Remains of Gasparinisaura are found in the Río Colorado Formation.  With further digging (oh so witty) in The Dinosauria, I have been able to come up with other dinosaurs found in this formation. Here is a list of all of the dinosaurs mentioned in the book. 

Alvarezsaurus, a member of the group of dinosaurs known as the alvarezsaurids, a group of Maniraptoran dinosaurs thought to be fairly closely related to the ornithomimosaurs.  

Patagopteryx, a flightless bird that probably weighed around as much as a turkey.  

Neuquenornis, a small, pigeon-sized bird.  Apparently, paleontologists have not only discovered a partial skeleton of this animal, but also some eggs with embryos!  Pretty neat!  

Velocisaurus, a four or so foot long ceratosaur, not very well known.  A noasaurid, and, as you can see in the pictures below (all four of the pictures are of Velocisaurus), looks a lot like its close relative, Masiakasaurus, whose picture you can see if you click on the word "Masiakasaurus" where it is yellow. 

Aucasaurus, a thirteen or fourteen foot long abelisaur, thought to be a close relative of Carnotaurus.  Known from a skeleton that is quite complete, but not yet fully described.  

Neuquenosaurus and Titanosaurus, a pair of sauropod dinosaurs. 

Animal Spotlight: Aurochs

This post is the birthday post of Govind Kamath!  Happy birthday, Mr. Kamath!  If you have a birthday coming up, just email me the date at cuyvaldar123946@gmail.com with the date and your favorite animal, and I will do my best to get a post in!

Over the years, you may have pondered, "Where does my burger come from?"  You probably just meant where was the cow that it came from.  But now here is something else for you to ponder.  Where the heck did the cow even come from?  Do you ever just see wild, black and white cows?  Well, I am here to tell you all about the evolution of the cow.

A Watusi/Longhorn pileup!  They actually crashed into each other, though!  Trust me, I was there, you can even see my sweatshirted elbow in the mirror thingy!

During the Pliocene Epoch, from around 5 to 2 MYA, the planet went through a cooler spell.  The frequent ice ages were a part of this cool spell, as was the most frequent Ice Age.  This colder weather caused many of the worlds forests to decrease in area, which in turn caused the world's grasslands to expand.  This led to the evolution of many large grazing animals, and helped contribute to the Pleistocene Megafauna, often called the Ice Age Megafauna.  One of these large animals that evolved was the Aurochs.

The Aurochs (Bos primigenius), first became domesticated during the Neolithic Age, or the "New Stone Age," probably around 12,000 years ago.  As a matter of fact, two waves of domestication occurred.  As you can see in the map below, there were three different subspecies of the Aurochs; one in northern Africa; one for Europe and Asia; and a third for the mysterious subcontinent of India, as Rajesh Ramayan Koothrappali says in "The Big Bang Theory."  The two different domestications happened with the Eurasian subspecies, Bos primigenius primigenius, and the Indian subspecies, B. p. namadicus. 

These two different domestications of these two different species of cattle led to two different domesticated cattle!  In India, we have the Zebu cattle, which has been given its own scientific subspecies name, Bos primigenius indicus.  The other, Eurasian kind has become the cow that we know today from driving down the street and the Chik-fil-A ads.  While other types of bovines (members of the family Bovidae, a group of ungulates that includes water and African buffalo, yaks, bison, and, of course, cattle) have been domesticated throughout the years, specifically the water buffalo, the south-east Asian Banteng, and the Indian Gaur, it is cattle that have remained the most widely used, for a wide variety of purposes, too.

The Aurochs is now extinct.  The very last recorded female passed away in 1627 in the Jaktorów Forest in Poland.

There are two particularly interesting breeds of domesticated cattle that I would like to now draw to your attention.  Back in December of 2011 on our trip down to Texas to visit my gramma, on the same trip where we visited the Heritage Museum of the Texas Hill Country and saw the Acrocanthosaurus footprints, we also visited the San Antonio Zoo, as well as the Natural Bridge Wildlife Ranch near San Antonio.  This is an awesome place for EVERYONE to visit!  You get to roll down your windows as you drive through a park chock-full of deer, antelope, zebra, and bovines, and you get to drop food for them!  There are also three members of the order Struthioniformes (aka the ratites), like the South American rhea, the Australian emu, and, most terrifying of all, the African ostrich.  The ostriches was absolutely terrifying, and I will talk about them in a later blog post!  But also at the ranch they had two pretty crazy types of cattle!

The first was the Ankole-Watusi, often called simply the Ankole cattle or the Watusi.  Originally bred in Africa, the Watusi was named after the Watusi tribesmen (now the Tutsi of Rwanda and Burundi).  This type of cattle has enormous horns that can span over six feet!  Both genders have these horns, and they can grow from between 1,500 - 1,800 pounds!  Below are some pictures that my family and I took of the cattle walking by our car!

A Watusi.  CHECK OUT THOSE HORNS!

Another Watusi.  CHECK OUT THOSE HORNS!

A baby Watusi!  HOW CUTE!

The second crazy type of cattle is the Texas Longhorn.  The Texas longhorn is, of course, native to the Lone Star State, and reports of the longhorn enduring thirst while still being able to fight off packs of wolves, as well as bears (presumably grizzly bears), from the pioneer times is not uncommon.  The longhorn, like the Watusi, also has six foot horns possessed by both sexes.  According to the Natural Bridge Wildlife Ranch Adventure Guide Book, the longhorn "helped form the basis of the ranching industry of the American West during the 19th century."

A Texas longhorn.  CHECK OUT THOSE HORNS.

Another Texas longhorn.  CHECK OUT THOSE HORNS.

The aftermath of the Watusi/Longhorn pileup seen above!

Whoever said cows weren't interesting!

Animal Spotlight: The Coati

First of all, everybody should like us on Facebook!  Here is the link: http://www.facebook.com/thenaturalworld1

 And next, lets take a look at today's "Animal Spotlight:" The Coati!

The coati is a creature of many names.  Often called the Brazilian aardvark, they are also called crackoons (pronounced like "raccoon") and (my personal favorite) "snookum bears."  The coati shares much in common with the red panda, one of the Animal Spotlights from earlier in the week.  It, like the red panda, is not a bear, despite what its nicknames imply, and is also a part of the superfamily "Musteloidea." 

The coati has a plantigrade stance, much like humans, bears, and its relative, the raccoon.  Look at the picture below.  See how the squirrel has the whole portion of its foot on the ground, while the dog has only part of its foot on the ground?  If you were to walk on the balls of your feet, then you would essentially be walking with a digitigrade stance as well. 

There are four species of coati.  Two of them have been labeled as "Least Concern" by the IUCN, but two of them have not been studied enough to formulate a conclusion as to their status in the wild.  That doesn't bode well, however.  Together, they live in the North American countries of the United States (Arizona, New Mexico, and Texas), Mexico, throughout Central America, and in the South American countries of Colombia, Venezuela, and Ecuador, just to name a few. 

Finally, here is a link to an interesting and amusing news article talking about wild animals running around in the UK.  Enjoy! 

http://www.bbc.co.uk/news/10365422

Animal Spotlight: The Red Panda

So for today's "Animal Spotlight," we are going to be taking a look at a very interesting creature: the red panda.  But how did I know this?  If you were an expert in logic and detective work, you might have already come to that conclusion, however, given the fact that not only did I post the title in the last "A Look Ahead," as well as by looking at the title of this post.  However, what you probably failed to take into account was that I, Zack Neher, and I alone, am the creator of this blog.  Therefore all executive decisions (i.e. what today's post is about) are made by me and my sole business partner, Chessney Von Pawncheck. 

OK, that is quite enough.  All long-winded explanations put aside, today's "Animal Spotlight" is, indeed the red panda.  The red panda is something of a misnomer.  Its scientific name, Ailurus fulgens, translates to "Shining Cat"; but the red panda is no cat.  Neither is the red panda a panda, as its name might imply.  Previously classified with the bears, and at another time with the raccoons (neither of which is the red panda), scientists now believe that the red panda deserves its own, special family, Ailuridae, within the superfamily of Musteloidea.  Within Musteloidea, besides the red panda, reside the weasels and kin, skunks and kin, and the raccoon, coati (the subject of this Friday's "Animal Spotlight") and kin.

A picture of the giant panda that my mother took at the San Diego Zoo

As you probably know, the Himalayas can get quite chilly at times.  To protect itself from the cold, the red panda has thick fur, as well as fur on the soles of its feet, which serves the double purpose of keeping its feet warm, but also helps to provide a bit of traction on ice.  When the snow melts, the hair-created traction also assists the red panda in obtaining a grip on the wet, slippery branches of its forest home. 

Although mostly a vegetarian, the red panda is certainly not above scavenging eggs from a birds nest.  They consume a great deal of bamboo, just as their namesake does. 

Listed as "Vulnerable" by the IUCN, the red panda lives in the Himalayan temperate forests of Nepal, China, Tibet, India, Bhutan, and Burma, as you can see in the map.
 But for those of you who want a bit more happiness when it comes to the red panda, simply click on the amusing video link below!

Red Panda Vs. Pumpkin

Animal Spotlight: The Tapir

This post has been made into a Video Blog Post.  To view it on YouTube, click HERE, or below.

Today's featured animal is the tapir, an odd, pig-like creature from South and Central America, as well as parts of south-east Asia.  There are four different types of tapir: Brazilian, Baird's, mountain, and Malayan.  Collectively, their closest living relatives are the rhinos and horses.  Unfortunately, all four of the tapirs are classified by the IUCN as "Vulnerable," or "Endangered."

Despite their bulky appearance (between 300 and 700 pounds, and around seven feet long), tapirs can run surprisingly fast.  This, along with the thick skin that helps to protect the back of their necks, helps them to avoid their main predators, like jaguars, tigers, caimans, and anacondas.  Although the distinctive coat patterns of adult tapir help to camouflauge them a bit, the young are especially camouflaged, with spots and stripes, much like two of their main predators, the jaguar and tiger, respectively.

A statue depicting the struggle between a pair of jaguars and their tapir prey.  The statue was one of many at the fantastic Brookgreen Gardens near Myrtle Beach in South Carolina.

According to Japanese folklore, the tapir will eat your dreams.  It also features in both Chinese and Korean mythology, as well. 

Each species of tapir has its own range, generally with little or no overlap.  The Brazilian tapir inhabits most of northern South America, generally not venturing much further south than the Tropic of Capricorn.  Meanwhile, the Baird's tapir lives in southern Mexico, Central America, as well as the South American country of Colombia.  It is also possible that it lives in Ecuador.  Next, the mountain tapir lives in just a small strip of land in the South American countries of Colombia, Ecuador and Peru, in the Cordilerras Mountains.  Finally, the Malayan tapir is found in the lowland rainforests in the countries of Cambodia, Indonesia, Laos, Malaysia, Burma, Thailand, and Vietnam. 

Don't forget to check in later in the day for this weeks "A Look Ahead!"

Animal Spotlight: The Capybara

Today, we are going to investigate the capybara (Hydrochoerus hydrochaeris).  Listed as "Least Concern" by the IUCN, both parts of its scientific name, hydrochoerus and hydrochaeris mean the same thing.  As you probably noticed, they both contain the Greek root "hydro," which, as you probably know, means "water."  The second half would be forgivable if you were unfamiliar with it: it means hog, or pig.  So, from its scientific name, we can assume that the capybara is a water pig.

Again, it would be understandable if you were to think that, as the capybara most definitely resembles a pig, at least superficially.  However, the capybara is not pig: instead, it is a rodent, related to creatures such as chinchillas.  As a matter of fact, the capybara is the world's largest extant rodent! 

Semi-aquatic, the capybara has evolved webbed feet, like many other semi-aquatic animals, like the POLAR BEAR.  An herbivore, the capybara must face attacks from many predatory animals, including the caiman (a relative of a crocodile), eagles, ocelot, puma/mountain lion, jaguar, and the anaconda, for who the capybara is its favorite meal.  The capybara generally travels in herds of around ten or twenty, but groups of up to one hundred have been seen before.

Capybara are fairly common zoo animals, and, when they escape into the wild, if they can find a semi-aquatic habitat that they like, they can often survive and thrive.  Sightings are common throughout Florida, and there have been sightings in California as well. 

When it isn't an escaped convict of the zoo, the capybara lives throughout most of mainland South America (thus excluding Trinidad and Tobago), except for the country of Chile.  These countries are Peru, Ecuador, Colombia, Venezuela, Guyana, Suriname, French Guyana, Brazil, Uruguay, Argentina, Paraguay and Bolivia.

Not enough capybara for you?  Well just check out these two amusing video clips below!  The first one shows a capybara with a case of the hiccups at the Bristol Zoo in England (UK), while the one below shows squirrel monkeys riding capybaras at the Saitama Zoo in Saitama, Japan.

The Hiccuping Capybara

Squirrel Monkeys Riding Capybaras


Finally, here are a pair of pictures that I took of one of the capybaras at the San Antonio Zoo in Texas.  Enjoy!

One of the capybaras sleeping at the San Antonio Zoo in Texas.

One of the capybaras sleeping at the San Antonio Zoo in Texas.

Animal Spotlight: The Polar Bear

The polar bear (Ursus maritimus) is the world's largest extant, terrestrial carnivore, with males growing up to 1,500 pounds.  Like many animals that spend a good amount of time in the water, their feet are partially webbed to aid in swimming.  Although the fur of the polar bear is white, to help it blend into the ice and snow when it is hunting seals, its skin underneath is black, to aid in heat absorption.

In the picture above, it certainly looks like the polar bear is just enjoying itself, and having a good time.  While both of these may be true, the polar bear is actually cleaning its fur, presumably after a kill, given the blood-stained snow off in the left of the picture.  Below the picture is a link to a video clip from BBC's "Planet Earth," narrated by one of my personal heroes, David Attenborough.  In the video, make sure to watch for the fur cleaning.

This is the link to the Planet Earth link: https://www.youtube.com/watch?v=OwZH_aT0FGI

The polar bear, due to its immense size and lack of natural predators, fears nothing, humans included.  This, coupled with a natural, and insatiable, curiosity, often brings bears and humans into contact.  The video clip below is from another BBC show, called "Polar Bear: Spy on the Ice."  I first saw this show when we were in South Carolina this summer, and found it really interesting!  This clip is one of my favorite parts from it.

Polar Bears Attacking Spy Cameras:  http://www.youtube.com/watch?v=DvduCPXO_FE

Finally, we have another interesting YouTube video that I discovered today.  Watch and enjoy!

https://www.youtube.com/watch?v=JE-Nyt4Bmi8

The polar bear's range covers five different countries: Russia, Denmark owned Greenland, Norway owned Svalbard, Alaska, and Canada.

Animal Spotlight: The Bobcat

First of all, remember, if you like what you are reading, hit the "follow" or the "subscribe" button below!"

The bobcat is one of three main felines that lives in North America, the others being the Canadian lynx and the mountain lion.  (Although other cats, like the jaguar, jaguarundi and ocelot, do occasionally make it up to Texas and Mexico, generally they just live in Central and South America).  Labeled "Least Concern" by the IUCN, the bobcat averages around three feet in length, and is named such for the short, "bobbed" tail.

A bobcat at The Living Desert in Palm Desert, California.  Note the short, stubby tail.

The bobcat is quite adaptable; it inhabits almost every single environment that the Continental United States has to offer, as well as most of Mexico.  There are thirteen recognized sub-species of bobcat.  Furthermore, despite its size, can be strong enough to take down small deer.  Here is a link to a video about a bobcat that I found to be quite interesting.

http://www.youtube.com/watch?v=S5BfNtim148

When we went camping last week, twice did we see paw prints that looked too small to be mountain lion prints, and were most likely bobcat prints.  I was quite excited; unfortunately (but not surprisingly) we didn't see any of the cats themselves.  Here is one picture from each of the times we saw the tracks. 

East Palm Desert on Dwellable

Propleopus, the Carnivorous Kangaroo

Imagine you are on a safari to the Masai Mara National Reserve in Kenya.  If you timed your visit right, then the Mara is inundated with wildebeest and zebra, as well as numerous other herbivores.  You will probably see a number of carnivores as well: cheetahs, leopards, lions, and especially hyenas.  What you probably don’t realize is that most places aren’t like this.  The Masai Mara has one of the highest predator populations seen in Africa, due in large to the great number of prey animals available for a meal.  Regardless, you are forced to acknowledge that there are a great many more prey animals than there are animals to prey upon them. 

                This is known as the predator/prey ratio, and it can be seen all over the world, and can also be seen in the past.  While hundreds, sometimes thousands, of fossils of a single herbivorous dinosaur can be discovered, it is far more rare to unearth the remains of a predatory dinosaur.  But why is there this unbalance between predators and their prey?  Well, let’s take a look at a continuous, cyclical event that takes place in a period of 9.6 years in the wilderness of Canada, that should be able to shed some light on the situation.

                At the beginning of the almost-ten year cycle, we see a sharp increase in the number of hares.  When food is plentiful, these hares often produce two to three litters of around 12 leverets (baby hare) each.  After their numbers reach their limit, their population density reaches around eight hare per football field.  At this time, the hares have eaten all of the edible material they can reach.  Not only are they out of food, but the plants that they feed upon begin to create bitter chemicals in their leaves and edible parts, that keep the hare from digesting the plant material very efficiently. 

                While the hare population is flourishing so, the hare’s predators find an especially easy time of it.  Owls, wolves, and foxes all flourish, but one predator does particularly well: the Canadian lynx.  Hares consist between 40 and 85 percent of the average lynx’s diet, and they generally kill two hares every three days.  With such an explosion in hare numbers, all of these predators flourish, successfully raising more owlets, kits, and cubs.  However, shortly after the plants begin to release the anti-digestion chemicals, the hare populations tank.  With not enough food, many of the animals die off.  Then, a year or two after the hare die-off, the lynx also experiences a massive fall in numbers.  With the lynx no longer over hunting the hare, and the predator/prey ratio returned to normal, the hare starts the cycle all over again. 

                While this cycle seems to be a healthy part of the Canadian ecosystem, in other places, a rapid rise in the number of predators or prey could be disastrous.  Therefore, nature has made it so that, in a healthy ecosystem, the prey animals vastly outnumber the predatory animals.  But how does all of this tie into kangaroos?  We will get back to that in a minute.  First, let’s take a look at an extinct, 26,000 year old relative of today’s rat kangaroo. 

                First described by Australian zoologist Charles De Vis around the turn of the century, the holotype of Propleopus at first remained unique.  It wasn’t until the year 1967 that more remains belonging to the genus Propleopus appeared.  More was discovered in the following years, but very few remains have been discovered even to this day.  With millions of fossilized mammalian bones discovered in Australia, Propleopus are “known from teeth and jaws attributable to less than 20 individuals.” 

                There are multiple reasons why an animal does not appear with a great amount of frequency in the fossil record.  Perhaps it is because the animal was small; smaller bones are much more delicate, and therefore less likely to survive the fossilization process.  (They are also a lot smaller, and therefore usually harder to find then, say the humerus of an Brachiosaurus!)  Perhaps the animal lived in an environment where fossilization is unlikely.  For example, in millions of years, when intelligent life again evolves on this planet, or we are visited by intelligent life from elsewhere in the galaxy, they would find very little or no evidence of mountainous animals, like bighorn sheep or the snow leopard.  This is because mountains are in a constant state of geologic flux.  At times they are being pushed up; but even when they are rising, they are already eroding.  Given enough time, entire mountain ranges can disappear, or almost disappear, like in the Australian Outback.  Sometimes, it is because paleontologists are simply looking in the wrong places, and there are treasure troves of these animals just waiting to be discovered elsewhere.  It could also be because the rocks where the animal was deposited simply don’t exist anymore, something that is called an unconformity in geologist’s terms.  Maybe the animal was just not very successful, and went extinct after only a short amount of time.  The fossilized animal could also represent a transitional fossil, so creatures with those characteristics would have only been around for a few thousand years.  Or, of course, it could be because the animal was a predator, and there were fewer individuals to begin with.

                Now you are probably thinking that this is quite a leap.  Just because this kangaroo didn’t appear all that often in the fossil record doesn’t necessarily mean that it was carnivorous.  And you are right, as if this was the only evidence of Propleopus being a carnivorous kangaroo, I would be laughed right out of the Neolithic Age: and they, at best, had only a very, very primitive form of language, and probably would, at best, barely understand what I was saying.  However, there is more evidence in favor of a carnivorous Propleopus.  As I am fond of saying, “the teeth tell the tale.” 

                Studies of the dentition of Propleopus show a close resemblance to small, extant insectivores or omnivores, i.e. the mountain pygmy possum and the musky rat kangaroo.  Where the teeth of Propleopus differ from the mountain pygmy possum and the musky rat kangaroo, however, the differences “could be interpreted as adaptations to meat-eating.”  To sum up, the incisors are short, stout, and appear great for stabbing, the premolars are strongly serrated, which is perfect for tearing into very tough stuff (perhaps tendon), and the molars are greatly reduced in size, as sometimes seen in the genus Wakaleo, one of the genera of marsupial lion, like Thylacoleo.  Furthermore, the molars, although reduced in size, share similar features to the largest extant marsupial carnivore today, the Tasmanian devil.  These features in the Tasmanian devil serve to keep bone splinters from penetrating the gums, and clearly would not be needed to serve that purpose in an herbivore. 

                The most revealing tale of the teeth can only be revealed by a microscope.  Studies have shown that, when you compare the microscopic wear patterns on the teeth of a herbivore and a carnivore, you can see obvious, and distinguishable, differences.  The teeth tell the tale of the diet of an animal, and help to show us what Propleopus might have eaten.  When compared with the wear patterns of closely related herbivores, like the musky rat kangaroo, and marsupial and placental carnivores, like the thylacine, Thylacoleo, and dogs, the wear patterns seen on Propleopus resembles that of the carnivores more so than that of the herbivores. 

                So was Propleopus a carnivore, or a herbivore, or both?  One hypothesis that has been put forward is that Propleopus was situated in a similar ecological niche as the modern day African baboon, eating whatever came it way, be it plants, eggs, insects, or meat.  Whatever the answer, is is doubtful that it could be answered now, and it is likely that only further research, and more discoveries, will ever hope to unravel the mystery surrounding Propleopus, the seemingly killer kangaroo.  

The Cichlids of the African Rift Lakes

Three of the largest lakes in the world reside in the 3,700 mile long Rift Valleys of Africa.  These lakes, Lakes Victoria (located in the countries of Kenya, Uganda and Tanzania), Tanganyika (split between Burundi, the Democratic Republic of the Congo [DRC], Tanzania, and Zambia), and Malawi (located between Malawi, Mozambique and Tanzania), rank among the top ten largest lakes in the world; third, seventh, and ninth, respectively.  (For some reason, these rankings differ upon where you look.  Lake Victoria as the third largest lake seems pretty universal, but the ranks of Tanganyika and Malawi differ for whatever reason.  You'd think that it would be pretty universal, but I suppose not.)  Besides being such large lakes, these lakes are important for other reasons, perhaps the most important reason (for biologists, at least) being their isolation.

You see, the three great lakes are islands, of a sort.  According to Websters, the definition of an island is "a land mass smaller than a continent and surrounded by water."  The Rift Valley lakes are essentially the opposite; "a body of water smaller than an ocean and surrounded by land."  For our purposes, an island is just something that has been isolated for a time, and allowed its flora and fauna to flourish in new and interesting ways.

And flourish it did in the Rift Valley lakes.  If you were to visit these lakes, snorkel or scuba in their waters, you would most likely notice a wide variety of fish.  You would not be wrong in this assessment; however, you might be surprised to find that most of these types of fish are belonging to a group called the cichlids (SICK-lids), and that all 1,650 plus species of these cichlids descended from a common ancestor.  While the dates of when the common ancestor of the various cichlids came to be trapped in their respective lakes, it has been estimated that the cichlids of Lake Malawi all evolved from a common ancestor trapped 700,000 years ago, and those of Lake Victoria around 12,000 years ago.  Trapped in these growing lakes while they were being formed, this small group of fish quickly came to dominate their new home, exploding in biodiversity to adapt to the wide variety of niches left open to them.

Tenuous can this biodiversity be, as recent logger-based erosion has shown.  Logging nearby to one of the lakes resulted in rapid erosion.  This erosion caused a great deal of silt to build up in one of the lakes.  This, of course, caused the water to become quite murky; think about your average beach, and how murky the water often is near the shore.  Many of the cichlids that lived in this area relied upon visual identification to recognize members of the same species for mating purposes.  With the cloudy, muddled water, this became quite difficult.  As a result, many fish from closely related species ended up mating with each other and, in the case of many of the couplings, resulted in viable offspring.  These viable offspring in turn bred with other species, lowering, at least temporarily, the biodiversity of the cichlids in this particular corner of the lake.

Blantyre on Dwellable

Animal Spotlight: The Mountain Pygmy Possum

You've probably never heard of the mountain pygmy possum (Burramys parvus); few people have, it being one of Australia's many lesser known marsupials.  One of five extant (opposite of extinct, or still living today) species of pygmy possum, the mountain pygmy possum has a very interesting story about its discovery, a story that we will now look at.

The genus Burramys, the genus the mountain pygmy possum is a part of, also contains three extinct species of possum.   In fact, prior to 1966, the mountain pygmy possum had been described solely from fossils dated from the Pleistocene Epoch.  (The Pleistocene Epoch dates from around 2.5 million years ago to around 10,000 years ago, when the last Ice Age ended.)  It was first described from these Pleistocene fossils by the famous geologist/zoologist/paleontologist Robert Broom in the year 1896, and was assumed to be extinct, just like the other three members of the genus Burramys.  That is until 1966, when one showed up in a ski hut on Mount Hotham, a mountain in New South Wales, southern Australia, and home to the Hotham Alpine Resort.

Since this surprising discovery, scientists have located three populations of the Mountain Pygmy Possum in different spots in southern Australia.  Although it is exciting to discover a species that was previously thought to be extinct, it is saddening to find out that this animal has a wild population of a mere 2,000 individuals, and is labeled "Critically Endangered" by the IUCN.  Means have been taken to protect the mountain pygmy possum, including the so-called "Tunnel of Love," a little possum-path that granted the males better access to the female habitat, and helping to reduce fatal encounters with automobiles.

Works Cited:

Mountain Pygmy Possum. (n.d.). - Just another global2.vic.edu.au weblog. Retrieved June 29, 2012, from http://teacherrsc.global2.vic.edu.au/

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