A 125-million-year-old fossil from the early Cretaceous shows the skeletons of a smaller mammal biting a larger horned dinosaur, suggesting a much more complex ancient food web.
Researchers have examined the genomes of 240 mammal species. The project reveals when mammals evolved, how some developed the ability to hibernate, and clues that may help explain humans' brains.
Picture a hairless, wrinkly rodent about the size of a small sweet potato — kinda cool, kinda weird. They also are extraordinarily long-lived. Researchers are lining up to study their secrets.
These 160-million-year-old fossils are the oldest known examples of mammal relatives with the ability to glide. They're from an extinct lineage with no relationship to modern gliders.
A dragonfly with a 2-foot wingspan? A sloth the size of an elephant? Skunk Bear's latest video introduces the enormous, ancient relatives of modern animals — all in rhyming verse. Of course.
In "Mammal March Madness," you win or die. No basketball in this tournament — it's a simulated survival-of-the-fittest game set up by evolutionary biologists. The battle cry? Mammals suck ... milk!