Showing posts with label Bird of Prey. Show all posts
Showing posts with label Bird of Prey. Show all posts

Thursday, September 6, 2012

23 Fact Tuesdays: Ceratosaurus, Octopi, Aye-aye, and More!

Introducing:  23 Fact Tuesdays!  I'm thinking that (possibly) each week, we can look at twenty-three different groups of....things....and we can learn a fun fact about them each week!  Many of these topics feature North America, as that is where both I and most of my readers reside, but other topics include penguins, fossil horses, fossil mammals, early humans, various fish and birds, dinosaurs, and many more!
Here they are!

Don't want to read all twenty-three!  Well, in my opinion, the best ones are 10, 14, 15, 17, 18, and 19!  Enjoy!

1.  Alaskan Mammals:  The Sitka black-tailed deer will graze on beach plants like dune grass and kelp during the lean season.

2.  Alaskan Fish:  The whitefish may fast for eight or nine months during the lean season, surviving off of their stored fat.

3.  Dinosaurs:  In 1883, Ceratosaurus was the first large meat eating, or Theropod, dinosaur skeleton that was discovered more than half complete.  The first skeleton was discovered in Colorado.

4.  Dinosaurian Contemporaries:  Lagosuchus was either the direct ancestor, or a close relative of the ancestor, of the dinosaurs.

5.  North American Birds of Prey:  The robin-sized American Kestrel is not only the smallest hawk in North America, but it is also the most common.

6.  Tideland Treasures of South Carolina:  The palmetto, which is the state tree of South Carolina, can live for 75 years, and grow to a height of 60 feet, with a 1 or 2 foot diameter.

7.  North American Mammals:  The least chipmunk, besides eating the usual rodent foods like nuts, will also dine on insects, and occasionally small vertebrates.

8.  North American Hoofed and Marine Mammals:  The sperm whale is the largest of the toothed whales.

9.  North American Birds:  The common goldeneye will often take over abandoned woodpecker nests.

10.  Fossil Mammals:  Despite the fact that primates no longer live in North America, many paleontologists think that they either evolved there or in Asia.

11.  Penguins:  Despite the fact that most people think of penguins living in cold, snowy climates, the king penguin typically forms colonies in the shelter of dense tussock grass.

12.  Fossil Horses:  One species of Hypohippus, H. osborni, had weak and infrequently used side toes.  Although not very exciting sounding, this is an important step from multi-toed horse ancestors to the one-toed horses that we know today. 

13.  Dinosaurs....Again!:  Ornithomimus, one of the "ostrich-dinosaurs," lived both in the states of Colorado and Montana, but also in the country of Tibet.

14.  Extreme Abilities:  In order to protect itself from various predators and to hunt its various prey, the amazing Indo-Malayan octopus can mimic an enormous variety of different animals, including flounder, sea snakes, crinoids, jellyfish, lionfish, hermit crabs, stingrays, brittlestars, stomatopods, and sea anemones, amongst many others.

15.  Extreme Movement:  Although this dude looks like a worm or something, the caecilian is actually a close relative of newts and salamanders.  It lives strictly underground, and is rarely seen, despite the fact that they can grow up to five feet long.

16.  Extreme Growth:  The ostrich is a serious record breaker amongst birds.  Not only does it when the tallest bird and heaviest bird awards, but it also is the fastest runner, has the biggest egg, and has the largest eyes.  In fact, the smallest bird on the planet, the tiny little bee hummingbird, could easily fit inside the eye of the ostrich!

 17.  Extreme Families:  The "Biggest Nest of Any Bird" Award goes to the orange-footed megapode, or the scrubfowl.  Although these nests are just on the ground (the biggest nests in trees are built by bald eagles), they are still very, very impressive.  On average, these nests can be 11.5 feet wide and 39 feet tall!  The biggest ever recorded, however, was a whopping 164 feet wide!

18.   Remarkable Mammals:  The aye-aye, possibly one of the creepiest looking animals in the natural world, is a type of lemur whose large incisor teeth grow continuously.

19.  Remarkable Birds:  Once thought to be the missing link between reptiles and birds, the South American Hoatzin hatches out of its egg with claws on its wing greatly resembling those of the ancient Late Jurassic bird Archaeopteryx.  These wing claws are not often, and maybe even never, found on birds today, with the obvious exception of the baby Hoatzin.  As the Hoatzin grows, its wing claws disappear.  

20.  Remarkable Fish:  The electric eel can discharge fifty volts from its body.

21.  Remarkable Reptiles and Amphibians:  The Cuban tree boa will position itself in small apertures in caves, striking with deadly accuracy at bats that fly out of the cave.  Remarkably, the snake will do this in complete darkness, somehow sensing where the bats are.

22.  Prehistoric Animals:  Like Lagosuchus, Effigia is another possible relative of the dinosaurs.

23.  The Evolution of Humans:  Homo heidelbergensis is thought to have been the last common ancestor between the Neanderthals (Homo neanderthalensis) and us humans, Homo sapiens

Sunday, August 26, 2012

Birds of Prey on Marshall Road

Today, my friend Mona Kamath and I went out to find some birds of prey along a little side road off of Marshall Road between Boulder and Superior in Colorado.  We saw an abundance of them on this trip, perhaps more than on any other trip.  The only other trips that I can remember that could rival this one were one where I saw red-tailed hawks, kestrels, and turkey vultures, and another one where I saw red-tailed hawks, turkey vultures, and a golden eagle.

Today, we were rewarded with not one, but two golden eagles!  Below are some pictures taken by both me and Mona.

 
 
 
 
We also saw a number of turkey vultures circling overhead, and a pair of them perched on a fence nearby.  However, by far the most exciting vulture spot of the day was when a juvenile turkey vulture landed right behind us!  I stopped the car and Mona was able to snap a few pics.  Not quite as exciting as the time a few weeks ago when I was on this road, and saw a pair of turkey vultures and a bunch of magpies fighting over the remains of a small carcasses, maybe thirty feet from my car!  Note how similar the juvenile turkey vulture looks compared to black vulture adults.
 
I also saw a bird of prey perched upon a lamp post in the middle of Superior.  I don't know what kind it is, so if anyone can help me out with that, that would be awesome!  Anyways, here are a few pics of it:
 
 
One of my most favorite bird of prey moments on this road was perhaps a month or two ago when I saw a pair of hawks flying along calmly next to each other, and then they suddenly locked talons.  I'm not positive, but I believe that it might have been a courtship display!

Tuesday, August 14, 2012

Shrinky Dink: The Channel Island Fox and The Island Effect

If you (as a species) get trapped on an island, there is really one of three things that can happen.  The first thing, which seems to be like it would be the most common of the three things, is that you and your species would go extinct on the island.  Perhaps your species still survives on the mainland, but the island group has died off.  The second, and second most likely to happen (in my opinion) is you and your species, over many generations, shrink, to match the food supply.  If there is a limited supply of food, then the smallest of your species, not the largest, are much more likely to survive.  And the third happenstance is that you and your species grow in size over many generations.  Say you and your species are rats.  On the mainland, you are preyed upon by dogs, foxes, coyotes, cats, and the like.  When you and other of your rat buddies became trapped on the island, there was an abundnace of food there, but no predators to prevent you from growing bigger.  So grow you did.  We will talk about a very interesting occurrence of this later on. This shrinking and growing, called "Foster's Rule," is often simply known as "The Island Rule."

For now, however, we are going to focus on the more common of the two, and the more interesting (both in my opinion); island dwarfism.  This has occurred many, many times throughout history, and even to humans!  However, today we are going to look at one particular occurrence of this dwarfism.  The Channel Island fox of the Channel Islands off of the coast of California.

Scientists believed that the ancestors of these foxes "rafted" to the northernmost islands in the island chain sometime between 10,400 and 16,00 years ago.  These ancestors would have been the gray fox, very similar to the ones we see today.  The foxes rafted over during the last Ice Age.  This would have dramatically lowered the sea levels, and much of the water that is in today's oceans would be locked away in the ice caps at the poles, or in glaciers.

As you can see in the map below, the four islands of San Miguel, Santa Rosa, Santa Cruz, and Anacapa are all located with only shallow water separating them.  During the Ice Age, with the lower sea levels, these four islands were all one island, called Santa Rosae.  Also at this time, the distance from the mainland to the "mega-island" would be much smaller, making the crossing for these gray foxes much easier.  It has been theorized that Native Americans then brought the fox to the four southern islands, as hunting dogs, or perhaps even pets. 
The mainland gray fox.  Photo credit Zack Neher, taken at Brookgreen Gardens in South Carolina.
Today, the fox only lives on six of the eight islands, with distinct sub-species on each island.  The fox still inhabits the islands of San Miguel, Santa Rosa, Santa Cruz, San Nicolas, San Clemente, and Santa Catalina (often simply called Catalina Island), and is absent from the islands of Anacapa and Santa Barbara.  While Santa Barbara is too small to support the food needs of the fox, Anacapa has no consistent source of fresh water.  The fox is the largest on Catalina, and the smallest on Santa Cruz.  The foxes on the southern three islands all have become separate at different dates, with the foxes of San Clemente estimated as being the oldest (becoming isolated between 3,400 and 4,300 years ago).  The San Nicolas fox is next, at around 2,200 years ago.  Finally, the foxes of Catalina Island, between 800 and 3,800 years ago.

Even smaller than the mainland kit and swift foxes, the Channel Island is the smallest of all of North America's foxes.  Like many island animals, the Channel Island fox is labeled as "Critically Endangered" by the IUCN, as they don't have much territory to spread into when humans influence them.  One influence was indirect, but still devastating for the foxes.  Prior to the 1990s, the golden eagle was a rare visitor to these islands.  The bald eagle, already well established in the area, was apparently a large deterrent for the golden eagle, preventing them from settling on the island.  DDT helped to eradicate the bald eagle on the Channel Islands, and with very few bald eagles in the area, the golden eagle moved into the gap: nature abhors a vacuum!

Anyways, the golden eagle, unlike the bald eagle (who is primarily piscivorous) would, and did, hunt the Channel Island foxes; at four times the foxes size, they were most definitely a force to be reckoned with.  That, coupled with diseases brought over from the mainland by domestic dogs, such as canine distemper, have also wreaked havoc upon the fox populations.  Conservationists are currently working on a solution, and tracking the foxes with radio collars seems to be helping them learn more about the foxes, in an attempt to prepare for the future. 

Tuesday, July 31, 2012

Animals of South Dakota: Part 2

NOW.  What animals should you be watching for on your trip?  Well, I am so glad you asked!  There are going to be three main areas where you would be able to see wildlife; the Prairies (P), the Pine Forests (PF), and the Black Hills (BH).

1.  Bison - If you are lucky, you might get stuck for a few minutes as a herd of bison crosses the road in front of you!  Be careful when viewing these animals, and use common sense; don't be the stereotypical stupid tourist and get yourself trampled to death by the bison.  They are the largest living mammals in North America, and can be testy. - P, BH


2.  Mule Deer - Just like we have in Boulder.  - P, PF, BH
A pair of mule deer fawns, near my house
3.  Pronghorn - One of my favorite animals, the Pronghorn Antelope is the second fastest animal in the world, and the fastest in North America, capabable of running around 61 MPH.  Why it can do that, we will talk about next Wednesday. - P, BH

4.  Red and Gray Fox, Coyote - Just like we have in Boulder, except for the Gray Fox. - P
A picture of a gray fox, taken by me at Brookgreen Gardens in  South Carolina
5.  Turkey Vulture - Watch for these guys anywhere, but they should be especially easy to spot on the vast swathes of prairie separating you from South Dakota.  They are instantly recognizable by their "V-Shaped" wing profile, their relative lack of wing-flapping, as well as the fact that they are probably circling something in the air.  Usually groups of them will signifiy a dead animal, as they are carrion eaters. - P, PF, BH

6.  Bighorn Sheep - Just like we have in Colorado - PF, BH

7.  These are the main ones to watch for, but if you get really lucky, you might see one of the black-footed ferrets in the Badlands, or a badger in the prairies!

Wednesday, July 25, 2012

What Is It? The Weekly Challenge #3 Answer

Today's animal was easier for many of you, and we had a number of good guesses!  We had a few close guesses (like the American Kestrel, another North American bird of prey, but we had one totally right answer.  This weeks winner is Julie N., who guessed the Peregrine Falcon!
Peregrine Falcon
 The Peregrine Falcon is one of my favorite birds, mainly because of how it hunts.  It dives at medium-sized birds from up to 3,000 feet in the air, and often dives towards the birds with the sun at its back; that way, its prey has a difficult time of seeing them through the sun's glare.  In its dive, speeds of 175 - 200 mph have been recorded, placing it at the terminal velocity able to be achieved by the bird.  Some people have reported that the peregrine can exceed terminal velocity but, despite being taken in by this theory for a time, I believe that this not, in fact, true.  (I am not that into the math or physics, but I believe it might even be impossible, but I'm sure some of you know that better than me!)  Click on the link below to learn a little more, and to see the bird in action!

http://www.youtube.com/watch?v=cKqt05iR9WI&feature=player_embedded#!

Although their population numbers suffered tremendous, pesticide-induced blows during the 20th century, they have made quite a comeback throughout the United States.  However, it was a close call.  Use of pesticides like DDT (commonly known as DEET, used to be common in mosquito repellent before its negative impacts on the environment became fully known) caused the Peregrine Falcon's eggshells to become weak, and they were easily broken.  The result of this was very few baby falcons surviving to breed themselves.  In fact, at one point it got so bad that the Peregrine Falcon was listed as "Endangered" by the IUCN in the 1950's through the 1970's.  It became extirpated, or locally extinct, in both Belgium and the eastern United States.  However, now it is labeled as "Least Concern;" an amazing comeback, for an amazing bird.

This picture of the Peregrine Falcon was taken by me, last week at the Reptile Day at Dinosaur Ridge, near Golden.  My friend Masaki Kleinkopf and I went and were able to see a few pretty cool things, the Peregrine Falcon being just one of them.  I highly recommend going to check out the Ridge, as well as the museum they have there, it is really quire interesting!

Don't forget to check in later in the day for this week's challenge!
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