Showing posts with label Spider. Show all posts
Showing posts with label Spider. Show all posts

Monday, April 15, 2013

23-Fact Tuesday: Strange Evolution of the Wild Pacific

So the other day, I enjoyed a Discovery/BBC program entitled "Wild Pacific," all about animals and humans in the Pacific.  This episode was entitled "Strange Evolution," and boy, were some of these guys strange!  Let's take a 23-Fact Tuesday look at some of these bizarre creatures!  Allons-y!

1.  The dingiso, a bear-faced, dog-sized tree kangaroo native to the rainforests of New Guinea, only became known to science in 1994, showing that there are still many, many fascinating natural phenomenon that have yet to be discovered by humans!

2.  Prior to the arrival of humans on Hawaii, it has been estimated that only one new species of animal or plant washed up on the shores every 35,000 years!

3.  With few terrestrial predators on the islands of New Zealand, the Fiordland crested penguin has moved from nesting along the shore to nesting within forests, moving along freshwater streams to reach their nests!

4.   The young of the Fiordland crested penguin are, of course, born in the forests.  They don't actually see the ocean (although the nests are usually close enough to hear and smell it) until they are about three months old, at which time they embark on their very first fishing trip: alone!

5.  On the island of Santa Catalina in the South Pacific, local fisherman fish in a simply fascinating fashion: they actually use spider webs from the golden orb spider that are reportedly as strong as kevlar to capture fish whose mouths are too narrow for conventional fishhooks!  Click on the link HERE to watch a short and fascinating video about this!

6.  Prior to human colonization of New Zealand, the only mammals that made it to its shores were bats and marine mammals.

7.  With so few terrestrial predators, one bat, the short-tailed bat, actually spends much of its time on the ground, foraging through the leaf litter, searching for the flightless weta, a relative of the locust.  In order to prevent damage to their delicate wing membranes, the short-tailed bat has developed special sheaths on its wings.  Interestingly, this terrestrial foraging behavior is probably very similar to how the bat's mouse-like ancestors behaved.

8.  The flightless kakapo is the world's largest parrot, and has developed sensitive whiskers on its face in order to help it navigate its way through the dark.  It's nocturnal behavior, as well as its size I would assume, has earned it the nickname "the owl parrot."

9.  The favorite food of the kakapo are the tiny seeds of the rimu tree and, since the bird is flightless, it has developed strong claws to help it climb up into the trees to reach the seeds.  Interestingly, the kakapo only breeds when the trees produce a "bumper crop," which is only about once every four years or so.

10.  Due to this odd cycle of breeding of the kakapo, the bird reproduces less often than almost any other bird.  By contrast, however, it lives longer than most others, sometimes up to 60 years!

11.  During breeding season, the male kakapo makes a "booming" sound to attract a female.  The male booms nonstop each night for 8 hours a night for up to three nights, resulting in thousands of booms.  The wind can carry the booms for up to three miles!  The female, of course, only responds to the males booms if the rimu seeds are plentiful.  Click HERE to check out some footage of the kakapo booming.

12.  LAST KAKAPO FACT, I PROMISE!!  The kakapo was almost hunted to extinction by humans for food and feathers, but they are making a human-assisted comeback now, climbing from only 51 individuals in 1995 to 91 individuals today!  (Possibly more, as I believe the television program is a year or two old or so.)

13.  The Australian brushtail possum was imported by colonists for fur to New Zealand over two centuries ago.  With no natural predators, however, it has spread like a plague, stripping trees of their vegetation.  About 70 million of them are estimated to inhabit the forests now.  That's like 350,000 a year, not including the ones that died.  Holy.  Cow.

14.  Introduced species can cause terrible problems to insular (island) ecosystems.  One of the most extreme examples is thought to be Easter Island, where it has been hypothesized that rats were what did in the colony.

15. For nearly 100 million years, the tuatara and its ancestors have remained almost entirely the same.  During the time of the dinosaurs, the tuatara's ancestors were very numerous, but following their extinction 65.5 MYA, they just couldn't compete, and were slowly extirpated across the globe.  Except in New Zealand, where they still reside today!  Incredibly, the tuatara sometimes can go an entire hour with only one breath!

16.  60 MYA, what is now the island of New Caledonia broke off from Australia, and is now 800 miles from the mainland.  This has allowed its native fauna to evolve in new and fantastic ways: such as the flightless, chicken-sized kagu, the only extant member of an ancient lineage.  HERE we have a fantastic video of this ridiculous bird!

17.  The monkey-tailed skink is the largest skink in the world, and is native to the Solomon Islands, an archipelago of nearly 1,000 tropical islands).  The monkey-tailed skink grows to around 3 ft. in length and weighs around 2 lbs., which is about 1,000 times heavier than the world's smallest skink.

18.  The monkey-tailed skink is an oddity amongst skinks.  Not only is it the largest skink in the world (as we mentioned above), it is also the only skink in the world to have a prehensile tail, which it uses to grasp branches while climbing in trees, assisted by its thick, sharp claws.   This is also an oddity, as most skins are terrestrial (meaning they live on the ground), as opposed to arboreal (which means that they live in the trees).  Furthermore, most skinks are insectivores, while the monkey-tailed skink is mostly vegetarian, consuming the leaves in the trees.

19.  The New Zealand kea, named for its call and native to the southern Alps, is considered to be one of the most intelligent and playful birds in the world.  As a matter of fact, some keas will damage cars out of curiosity!

20.  Up to thirty non-native species arrive on Hawaii every year due to humans, such as the Jackson's chameleon, native to east Africa, which was imported in the 1970s to Hawaii as an exotic pet.

21.  Another biological organism introduced by humans to Hawaii was sugarcane.  Like most places that humans visited, however, they also accidentally introduced rats.  And the rats ate the sugarcane.  Well, the humans who were trying to make a profit off of the sugarcane didn't like that, not one bit.  So, in the hopes of extirpating the rat population, the humans introduced the Indian mongoose.  However, what the humans failed to take into account was the fact that the Indian mongoose is diurnal, or lives during the day....while the rats are nocturnal, and move around at night.  So instead of eating the rats, the Indian mongoose eats the native birds.  Hawaii: 0.  Human Stupidity: A whole lot more than it should be.

22.  The ancestors of the I'iwi, a long billed honeycreeper endemic to Hawaii, were blown to Hawaii about 4 MYA, and looked very different from what they looked like today.  It is thought that they looked something like the Palila, a short billed finch that uses its tough beak to tear open tough seed pods.

23.  The last fact isn't from the program.  It's from "The Song of the Dodo" by David Quammen, one of my favorite books of all time.  It's a quote: "Islands are where species go to die."  He means that islands can be very dangerous places for animals to live.  But now with all the messes humans have introduced, that effect has been exasperated.  Just something to think about.

Friday, February 8, 2013

Museum Spotlight: California Academy of Sciences

Another really cool museum that my family and I visited in California was the California Academy of Sciences.  They had lots of really cool exhibits!  My favorite was a prehistoric mammals exhibit, but unfortunately, pictures weren't allowed inside, so therefore I don't have any pictures!  We also didn't get to visit the whole museum, but the parts that we did we all really enjoyed!  But I did get a few pictures of some of the other really cool things, so here they are!  A brief overview of the California Academy of Sciences!  Enjoy!  First, we are going to look at what they call "The Living Roof," which is a cutting edge....garden.  However, although it does sound a bit unexciting, it was actually pretty cool, as the cutting edge garden was on the roof!  (Hence the name "The Living Roof," in case you missed that part.)  It actually always reminds me of the Shire from Lord of the Rings!
Although I didn't get any pictures of any prehistoric mammals, I did get a picture of another prehistoric animal!  Does anybody know what it is?
One particular exhibit was called "Rainforests of the World," which, as you can imagine, focuses on the worlds rainforests.  It was really cool, and it was all inside of this enormous dome thing!  But yeah here are some pictures from inside of the dome!
 
 
Finally, the last thing that we saw that I thought was really cool was this: an albino alligator!  Definitely don't see those every day!

Tuesday, November 27, 2012

Upcoming Lecture: Animal Adventures With Zack Neher Part 1

Hey everyone!  So I just wanted to let you know that I am going to be having a trio of lectures next calendar year, and the first one is rapidly approaching!  It is on Thursday, January 10th from 4:00 PM to around 5:15 PM.  It will be held in the main auditorium at Fairview High School in Boulder, Colorado, and the address is 1515 Greenbriar Boulevard.  Admission will be free, but 90% of the proceeds will be going towards the Morrison Natural History Museum where I volunteer, while the other 10% will be going towards funding the Fairview Knowledge Bowl Team.  HERE IS THE LINK TO THE ZACK NEHER'S LECTURES PAGE ON FACEBOOK, WHICH YOU ALL SHOULD LIKE!

What will be at the lecture?  Well, just like last time, we will have a fossil table down in front, with tons of fossils, ranging from whale and bison bones to spiders preserved in amber, red fox skulls to mosasaur jaws, and much, much more! 

And, most importantly, what will we be talking about at the lecture?  Well, I am just so glad you asked!  This lecture is going to be covering a very wide variety of seemingly-unrelated topics.  But never fear, for I have artfully woven them into an intricate tapestry of fun.  Here are some of the topics and animals that we will be learning about!

I guarantee that it will be a fun-filled and entertaining evening chock-full of awesome animals, amazing video, and more than a fair share of Psych references!  So please, join us if you can!  Hope to see you all there!

And please, if you like what you're reading, make sure you click the subscribe button off to the right!  

    Saturday, November 3, 2012

    The Archosaurs: A Brief Summary of Reptilian Evolution

    320 million years ago, during the Carboniferous Period, the flora and fauna looked quite different than it does today.  Oxygen levels in the atmosphere were much higher, allowing insects to grow to enormous sizes.  Centipedes were the size of snowboards; dragonflies were the size of hawks; and spiders were the size of dinner plates.  There were also no mammals.  Not only that, but there were no reptiles, no dinosaurs, and no birds (which, of course, are dinosaurs).  There were, however, amphibians.  Amphibians, like frogs and salamanders, cannot lay their eggs on dry land, and instead must lay them in pools of water.  This is because the eggs that they lay, unlike those laid by dinosaurs, birds, reptiles, and monotremes (the two egg-laying mammals), have soft-shelled eggs, which allows water to move in and out of them.  They would simply dry up on land!

    Around 320 MYA, however, something changed.  Some of these amphibians developed what is known as an "amniotic egg," the type of egg typified by the dinosaurs, birds, reptiles and monotremes.

    Around 5 million years after that, around 315 MYA, another major split occurred, this time between the amniotes.  This split resulted in two lineages, the first of which, the synapsids, would one day become the mammals.  The second of these two lineages was the sauropsids.   Within the sauropsids was the group known as the archosaurs.  The archosaurs, in turn, suffered two major splits.  The first split was the crocodiles, alligators and their kin.  They joined with the rest of the reptiles contained within the sauropsids.  The second large split within the archosaurs was another large group, off of which the pterosaurs broke off, before the rest of the group became dinosaurs (and, in turn, birds).  If you look at the family tree below, you can see that the group known collectively as the "reptiles" is what is referred to as a "paraphyletic group."  Put simply, that means that a paraphyletic group consists of "all the descendants of the last common ancestor of the group's members minus a small number of monophyletic groups of descendants, typically just one or two such groups." So for reptiles, that means that the group consists of the last common ancestor of all reptiles (which includes both extant reptiles and the extinct mammal-like reptiles, the precursors of the mammals), including all of the descendants of that ancestor....EXCEPT for the mammals and the birds, which are defined separately.  I feel like I have confused you enough, so I am not even going to get into the whole dinosaur debate.

    Sunday, July 1, 2012

    Fossil Hunting 6/30

    Yesterday, my friend Masaki Kleinkopf and I went to check out a fossil site that I had found with another friend a couple of days ago. It looks to be Laramie Formation (towards the end of the death of the dinosaurs, in the Late Cretaceous), and a river seems to have been in this area. The most exciting fossilized things we found was a bunch of fossilized wood, as you can see below.
    Fossilized wood
    More fossilized wood
    However, the most exciting that we saw of the day was definitely a wolf spider, probably three inches across. We saw the web first, and I was going to try and get the spider to come out with a long piece of grass (didn't want to get too close!) when I accidentally startled a grasshopper into the web. It couldn't get out, and suddenly the wolf spider appeared, and attacked it. It ran up probably ten or fifteen times, stabbing the grasshopper with its mandibles (I think that's what it was doing, anyways) and with its two front legs held up in the air. After awhile, the grasshopper was still alive, and the wolf spider retreated back down its hole. When we came back fifteen or so minutes later, the grasshopper was gone; probably dragged down by the wolf spider into its burrow to be devoured. I took a pic of the spider, but I think the  spider moved when it saw my phone, so all you can see is a blurry shot of the burrow.
    Wolf spider burrow.  I think that the darker black in the burrow might be the  spider.
    Besides wood, the Laramie Formation has yielded a number of dinosaur remains as well, among them being Edmontosaurus, Ornithomimus, Thescelosaurus, Triceratops, and Tyrannosaurus.  But first, here is a map of where the Laramie Formation is in Colorado.  Many of the dinosaurs that I mention below were found up in the north, near Fort Collins I believe.

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