mammal
laelaps | May 20, 2010Mammal hairs preserved in amber specimen ARC2-A1-3. a - First fragment; b - Line drawing of first fragment; c - Second fragment; d - Line drawing of second fragment; e - Close-up of second fragment to show the cuticular surface.
About 100 million years ago, in a coastal forest located in what is today southwestern France, a small mammal skittered up the trunk of a conifer tree. As it did so it lost a few of its hairs, and this minor event would have been entirely unremarkable if two of those hairs had not settled in some tree sap and, in the course of time, become entombed in a piece of amber…
laelaps | May 18, 2010A restoration of Megatherium from H.N. Hutchinson's Extinct Monsters.
For over a century and a half dinosaurs have been the unofficial symbols and ambassadors of paleontology, but this was not always so. It was fossil mammals, not dinosaurs, which enthralled the public during the turn of the 19th century, and arguably the most famous was the enormous ground sloth Megatherium. It was more than just a natural curiosity. The bones of the "great beast" represented a world which flourished and disappeared in the not-so-distant past, but, as illustrated by Christine Argot in a review of its history…
laelaps | May 15, 2010A baby Coquerel's sifaka (Propithecus coquereli), photographed at the Bronx Zoo.
laelaps | May 5, 2010Rokan the Sumatran tiger (Panthera tigris sumatrae), photographed at the National Zoo in Washington, DC.
laelaps | April 30, 2010I feel like I have been run over by a truck. Between blogging, working on my book, fieldwork, pitching freelance articles, and research, I just didn't have the energy to come up with something new today. Instead enjoy this post, written a little more than a year ago, about how the hip of a fossil whale was mistaken for the shoulders of an ancient bird. -- Brian
The right hip of Basilosaurus as seen in Lucas' 1900 description.If you were a 19th century paleontologist and you wanted a skeleton of the fossil whale Basilosaurus, there was only one place to look; Alabama. Even though fossils of…
laelaps | April 29, 2010
Utah may seem like an odd place to search for primates, but you can find them if you know where to look. Although scrubby and arid today, between 46-42 million years ago what is now the northeastern part of the state was a lush forest which was home to a variety of peculiar fossil primates. Called omomyids, these relatives of living tarsiers are primarily known from teeth and associated bits and pieces of bone, but newly discovered postcranial remains may provide paleontologists with a better idea of how some of these ancient primates moved.
For most of their early evolution omomyids were…
laelaps | April 17, 2010
What kind of social-insect-eating mammal is stranger than a numbat? Well, a pangolin, for one. From The Life of Mammals.
For more on the pangolin's prey, check out one of the newest additions to the ScienceBlogs family, Myrmecos.
laelaps | April 13, 2010A sloth bear (Melursus ursinus), photographed at the National Zoo in Washington DC.
laelaps | April 12, 2010An African wild dog (Lycaon pictus, left) compared to a spotted hyena (Crocuta crocuta, right). Both photographed at the Bronx Zoo.
It never fails. Whenever I visit a zoo's African wild dog exhibit someone inevitably asks "Are those hyenas?", and when I visit spotted hyena enclosures I often hear the question "Are those dogs?" These carnivores, known to scientists as Lycaon pictus and Crocuta crocuta (respectively), are only distant cousins, but the vague similarities shared between them often cause people to confuse one with the other.
There are a few quick and dirty ways to tell them apart…
laelaps | March 31, 2010A grey mouse lemur (Microcebus murinus). Image from Wikipedia.
Charles Darwin's visit to the Galapagos Archipelago has been celebrated time and again for its influence on his evolutionary thoughts, but I have to wonder what would have happened if the Beagle skipped the Galapagos and visited Madagascar instead. What would Darwin have made of the animals which had been evolving in splendid isolation on the African island? Would "Darwin's lemurs", rather than Darwin's finches, be among the most recognizable icons of evolution?
Answers to such questions are beyond our grasp, but the diverse array…
laelaps | March 29, 2010The fail whale comes to rest; the decomposing body of a gray whale is host to a diverse array of scavengers and other deep sea organisms. From Goffredi et al., 2004.
In the deep sea, no carcass goes to waste. Platoons of crabs, fish, and other scavengers make short work of most of the bodies which come to rest on the sea bottom, but every now and then the carrion-eaters are presented with a rotting bonanza; a whale fall. Muscle, viscera, blubber, and bone; it all gets broken down, but it takes so long that the whale carcass actually provides a temporary home for a variety of organisms which…
laelaps | March 28, 2010A stuffed polar bear (Ursus maritimus), on display at the New Jersey State Museum.
laelaps | March 27, 2010A stuffed North American river otter (Lontra canadensis), in the collection at the New Jersey State Museum.
laelaps | March 26, 2010A partially dissected head of an ocelot (Leopardus pardalis), showing some of the internal anatomy, in the collection at the New Jersey State Museum. (And here is a similar preserved sea lion head in the same collection.)
laelaps | March 21, 2010The mount of a musk ox (Ovibos moschatus), photographed at the New Jersey State Museum.