Showing posts with label Arctic. Show all posts
Showing posts with label Arctic. Show all posts

Saturday, June 15, 2013

Xiphactinus: The Inception Fossil

If you were to travel back 100 million years from where I live in Colorado, the face of a very, very different planet would emerge.  I suppose emerge isn't necessarily the best word in this context: submerged is more of an adequate description!  You see, unlike the mountains you would see in Colorado today, Late Cretaceous Colorado was even flatter than present-day Kansas....and a whole lot closer to sea level!  Between about 100 and 70 million years ago (MYA), an enormous seaway stretched northwards from the Gulf of Mexico, and southwards from the Arctic.  Within these waters, hundreds, perhaps thousands of animals flourished, many of which we have nothing like today.  Massive sea turtles like Archelon slowly swam through the waters, while the long-necked plesiosaurs cruised around, snapping up fish before they even knew they were there.  While sharks and mosasaurs were probably the most impressive denizens of the seaway, these massive carnivores fed on fish as well.  And the subject of today's post is one of those fish: a 17-foot long beastie called Xiphactinus.

Due to the numerous pictures uploaded to Pinterest by the Best Western Denver Southwest hotel (read more about it HERE), I'm going to be using a lot of pictures from this site!  Make sure you check it out by clicking HERE!  Unless otherwise noted, photo credit for all of the pictures in this post goes to that Pinterest page!

Why did I call Xiphactinus (pronounced zye-FACT-un-us) "The Inception Fossil?"  Well, that's a description that I came up with (don't ever let anyone tell you otherwise!) that has to do with one of the most interesting things about Xiphactinus: numerous specimens of the fish have been found with the remains of other fish in its stomach!  Just as the premise behind Inception is "a dream within a dream," so too are specimens of Xiphactinus sometimes "fish within a fish!"  The specimen below is a thirteen foot Xiphactinus that died with a fish known as Gillicus arcuatus in its stomach!

Unlike sharks, Xiphactinus would have been unable to bite off chunks of flesh from its prey, and instead would have had to swallow its prey whole, which is what makes the Inception Fossils so spectacular!  Some paleontologists propose that this lack of chewing may have been what killed some of these Xiphactinus specimens, and that they actually choked to death on their last meal!  I suppose it's possible, but I don't actually know enough about these specimens to be a very good authority on them!

The next three pictures below are pictures that I took of a specimen that I saw a week or so ago.  Long story short, my friends Isabel and Sam Lippincott and I had gone to a presentation given by paleontologist Dr. Ian Miller about the Snowmastodon Project a few months back, and he was impressed with Sam's paleo drawings when we showed him after the lecture.  He invited us to come on down to the Denver Museum of Nature and Science so that he could show us around behind the scenes, which he very kindly did a few weeks ago!  These are pictures I took of the 80 MY old Mancos Shale specimen of Xiphactinus, which was discovered in 1966 by some kids who had been hunting with their dad near Snowmass in Colorado.  They had stumbled across the rib cage of the animal, and had notified the Denver Museum.  The next summer, the museum excavated the remarkably complete, 13-foot specimen, taking it back to the museum, where it has been stored to this day!
Here are some more cool pictures from the Pinterest page!  This is a diorama of paleontologist Charles Sternberg caught in the act of discovering one of his "Inception fossils!"

And here are another pair of reconstructions of Xiphactinus!

Make sure to check out the Pinterest page of the Best Western Denver Southwest by clicking HERE!

Friday, January 25, 2013

23-Fact Tuesday: The Polar Bear!

Everyone loves polar bears, so today, for the birthday post of Brooke Harrower, we are going to be taking a 23-Fact Tuesday look at them!  Allons-y!

1.  Despite the fact that the polar bear can be quite a fierce animal, it can also be very playful and gentle.  For proof, click HERE to see a very cute video of polar bears playing with sled dogs!

2.  A group of polar bears is called a celebration.

3.  In an attempt to safely film polar bears up close and personal without disturbing them, one production company resorted to an interesting array of spy cameras.  To see an awesome video of the polar bears playing with the spy cameras, click HERE.

4.  As we saw in the previous video clip, the polar bear is quite the curious animal.  It has to be, to survive in such harsh conditions!  The polar bear is also a lot smarter than many other bears, as can be seen in a comparison of a few different bear brains, below!  Look at how much larger (comparatively) the brain of the polar bear is than that of the American black bear!  Also keep in mind that more wrinkles=a greater surface area=a smarter animal!

5.  Unlike the color of its fur, the skin of the polar bear is actually jet black!

6.  Despite the fact that they are often erroneously pictured together, it is almost entirely impossible for penguins and polar bears to meet naturally in the wild, as no penguins ever really make it past the Equator, with the Galápagos penguin living the furthest north, right on the Equator!  For more information on the subject (as well as some really funny stories) click on the link HERE, to check out a page on the awesome blog March of the Fossil Penguins.

7.  As you can see in the video clip HERE, filming the polar bears for the excellent BBC series Planet Earth could be quite a challenge (see the full post HERE), especially when they come knocking at your door!

8.  The polar bear is the largest extant (still living, opposite of extinct) mammalian carnivore.  The males can grow up to a whopping 1,500 pounds! 

9.  It occurs to me as I eat this delicious cherry popsicle that the polar bear must have some sort of special evolutionary adaptation to prevent brain freeze as it consumes a cold and frozen meal.  Research should be done into this.

10.  Polar bears, after their emergence from their dens following the harsh Arctic winters, have been observed sledding down the hills on which the dens are associated.  Some scientists believe that this action is solely intended to clean the fur, but many others (myself included) believe that it is probably more for fun!  Check out the video HERE.

11.  The polar bear is native to only five countries.  These are Russia, Denmark owned Greenland, Norway owned Svalbard, Alaska, and Canada.

12.  The polar bear is a descendant of the grizzly bear, and was once thought to have diverged from the grizzly possibly only even around 70-100,000 years ago.  Others are more conservative in their estimations, as DNA analysis on one particular fossil specimen indicates that the polar bear diverged from the grizzly bear around 160,000 years ago.  It now seems more likely that the age of divergence of was much earlier in time than even 100,000 years ago, and polar bear fossils dating from earlier than that (round 115,000 years ago) have actually been discovered.
A picture of one of the grizzly bears at the Cheyenne Mountain Zoo doing what the zookeepers call the "Yoga Bear."  This was from the behind the scenes experience that my dad, grandma and grandpa, my friend Masaki and I got to do with Kelley Parker a few months back!  Photo Credit: Masaki Kleinkopf.
Another picture of one of the grizzly bears at the Cheyenne Mountain Zoo doing what the zookeepers call the "Yoga Bear."  This was from the behind the scenes experience that my dad, grandma and grandpa, my friend Masaki and I got to do with Kelley Parker a few months back!  Photo Credit: Masaki Kleinkopf.
13.  The oldest polar bear fossil known to science, the lower jaw of a male, was discovered in 2004.  It's age is thought to be between around 110,000 and 130,000 years old. 

14.  The scientific name for the polar bear, Ursus maritimus is "sumitiram susru" spelled backwards.  This means absolutely nothing and is really not that exciting, unless you are me and think it's funny and clever to spell things backwards and make stupid jokes about it.

15.  Algae, while not threatening to a polar bear in any significant way, can be extremely hard to wash out of the bears fur.  So therefore, in the summer of 2008 when three bears at Higashiyama Zoo and Botanical Gardens in Japan got a bunch of algae stuck in their fur, they were green for the entire summer!  True story!

16.  The polar bear is a fantastic swimmer, aided by its streamlined body and skull as well as its partially webbed feet, and have been spotted swimming strongly in open waters as much as 200 miles from the shore!

17.  The polar bear will consume a wide variety of foods, including everything from seals to walrus, beluga whales to bowhead whale carcasses, birds, and even kelp!

18.  The polar bear is labeled as "Vulnerable" by the IUCN, a position which may deteriorate in years to come with the further melting of the ice caps.

19.  Hybrids of the polar bear and the grizzly bear, sometimes called grolars, have been known to occur both in the wild and in captivity, a further testament to the close genetic relationship between the two bears.

20.  Baby polar bears are possibly some of the cutest animals on the planet, as can be evidenced by the picture below of baby Anori from Germany's Wuppertal Zoo.

21.  Humans are the only animal that hunt polar bears.

22.  So well protected against the cold is the polar bear that they can quickly overheat, even when the temperature is below zero!  In order to combat this, the polar bear will try to avoid running and will rest for many many hours at a time.  Maybe my cat's a polar bear.

23.  Polar bears, like myself when Windows Movie Maker refuses to work, have actually been observed by scientists to throw tantrums when they fail to catch their prey!  The bears have been observed growling disappointedly, kicking piles of snow, and even throwing ice chunks!

Happy birthday Brooke, hope you enjoy!  And remember, 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!

Sunday, July 29, 2012

The Making of Planet Earth: The Polar Bear

First of all, don't forget to scroll down and look at today's official post, about the three-toed sloth! 

I almost forgot to tell you all about another very interesting video clip about the polar bear, from "The Making of Planet Earth."  The clip below, narrated by David Attenborough, features the challenges that the main cameraman Doug Allan, aided by his field assistant Jason Roberts, came up against when it came to filming the polar bears in Norway.  Not only is the video quite interesting, it gets amusing towards the end, as well!

Filming the Polar Bears

Below is a picture of cameraman Doug Allan.  In the picture below, he is staked out, attempting to film the snow leopard, one of my absolute favorite animals.  This elusive cat proved quite difficult to film, and, hopefully, sometime in the next few weeks I can talk about the difficulties the crew of Planet Earth encountered when it came to filming the snow leopard in the wild.

Saturday, July 28, 2012

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.

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