- News Home
6 March 2014 1:04 pm ,
Vol. 343 ,
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
- About Us
Video: Ancient Crocodile Chewed Like a Mammal
4 August 2010 3:10 pm
Please download the latest version of the free Flash plug-in.
Credit: Patrick M. O'Connor, Ohio University
It might look like the skull of an ancient mammal, but these 100-million-year-old fossilized remains, found in Tanzania, belong to a member of the crocodile family. As this animation shows, the teeth of Pakasuchus resemble those of a warm-blooded carnivore, with protruding canines (pink), sharp premolars (yellow), and flat molars (blue). All allowed the critter to bite, rip, and chew its food. Modern croc teeth, in contrast, are uniformly cone-shaped for seizing and tearing prey. Based on the rest of its anatomy, which includes four long, straight limbs, scientists have concluded that the animal roamed across the African savanna, feeding on large insects such as dragonflies and possibly newly hatched dinosaurs. This means, the team will report tomorrow in Nature, that Pakasuchus probably filled an ecological niche in the southern hemisphere that mammal ancestors were exploiting in the north. As a result, Pakasuchus could—like other ancient crocs discovered recently in Africa--find ways to live comfortably out of water.
See more Videos.