mammals
laelaps | April 5, 2010According to multiple reports released yesterday, scientists will announce the discovery of a new species of two-million-year-old hominin this week. Do you know what that means? That's right; writers are breaking out the pop-sci boilerplate to tell us all about the new "missing link." To paraphrase what I have seen in the headlines alone, the find is the "missing link which will shed new light on human evolution and rewrite what we thought we knew about our history."
I don't believe the hype, but I can only speculate on the actual significance of the specimens in question. According to the…
laelaps | April 2, 2010
A margay (Leopardus wiedii). From Wikipedia.
Even if they spend years in the field, researchers rarely witness predation on primates. Cats, birds, and other hunters regularly feed on primate species, but what we know about the habits of primate-hunters often comes from bones and fingernails picked out of predator droppings. Every now and again, though, someone is in just the right place at just the right time to observe a predator attempt to catch a primate for dinner, and one recent observation in the Amazon has revealed an ingenious hunting technique employed by a small spotted cat.…
laelaps | April 1, 2010
The partial faces of Anoiapithecus (left), Pierolapithecus (center), and Dryopithecus (right). (Images not to scale)
Our species is just one branch of a withering part of the evolutionary tree, the great apes. Along with the handful of species of chimpanzees, gorillas, and orangutans, we are all that is left of the hominids, and considering the threats our close relatives face we could very soon be the only great apes left. It has not always been this way. During the swath of prehistory ~23-5 million years ago known as the Miocene a variety of ape species inhabited forests through much of…
laelaps | March 31, 2010
A 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…
laelaps | March 30, 2010
Spotted hyenas giggling over an antelope spine. Courtesy BMC Ecology.
For spotted hyenas, a laugh can speak volumes about an individual.
Despite being portrayed as stupid scavengers who rely on the leftovers of lion prides, hyenas are highly intelligent and social predators. They communicate with each other through an array of whoops, yowls, grunts, screams, and giggles, and by using these calls an individual can call in help to run lions off a carcass or signal that it's time to beat a hasty retreat if the odds don't look as favorable. Yet there is more to a hyena call than just its…
laelaps | March 29, 2010
As I mentioned in today's post, dead whales provide food and homes for a variety of marine organisms, and this video (uploaded by Kevin Zelnio of Deep Sea News) shows how whale fall communities change over time. It was produced by the laboratory of Dr. Craig Smith, University of Hawaii.The bone-dwelling worms I wrote about can be seen starting at the one minute mark.
laelaps | March 29, 2010
The skeletons of an adult and a juvenile manatee (Trichechus manatus), on display at the North Carolina Museum of Natural Sciences.
laelaps | March 29, 2010
The 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…
laelaps | March 28, 2010
A stuffed polar bear (Ursus maritimus), on display at the New Jersey State Museum.
laelaps | March 27, 2010
A stuffed North American river otter (Lontra canadensis), in the collection at the New Jersey State Museum.
laelaps | March 26, 2010
A 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 24, 2010
Our temporary houseguest, Rusty, playing in a stream in northern New Jersey.
laelaps | March 23, 2010
A stuffed cougar (Puma concolor), photographed in natural history collection at the New Jersey State Museum.
laelaps | March 23, 2010
A comparison of three-dimensional scans of hominin footprints. Top) A footprint made by an experimental subject using a normal, "extended" gait. Middle) A footprint made by an experimental subject using a "bent-knee, bent-hip" gait. Bottom) A Laetoli footprints. From Raichlen et al., 2010.
About 3.6 million years ago, at a spot now in Laetoli, Tanzania, a pair of hominins trudged through the ashfall dumped onto the landscape by a nearby volcano. We don't know for certain what they looked like (it is generally believed that they were Australopithecus afarensis from the presence of fossils…
grrlscientist | March 21, 2010tags: Life, Discovery Channel, Reptiles and Amphibians, Waterfall Toad Leap from Danger, animals, mammals, birds, BBC, television, streaming video
Gail Weiswasser at the Discovery channel emailed a few days ago to tell me about TONIGHT's premiere on the Discovery Channel of BBC's LIFE, the 11-part follow up to PLANET EARTH (the most successful natural history documentary of all time). While PLANET EARTH told the story of the natural world through the framework of our planet's ecosystems and regions, LIFE takes us on a more intimate journey, introducing different animal and plant groups, using…
laelaps | March 21, 2010
The mount of a musk ox (Ovibos moschatus), photographed at the New Jersey State Museum.