The researchers also studied fossils of extinct fishes dating back almost 400 million years and saw evidence that some of the oldest jawed fishes had bones with joint cavities for articulated ...

The dinosaur, named Duonychus tsogtbaatari, measured about 10 feet (3 meters) long, weighed approximately 575 pounds (260 kg) ...

Zebra finches learn their courtship songs early in life by first listening to their fathers and memorizing the melodies.

With two-fingered hands and long "nasty" claws, the Duonychus tsogtbaatari is certainly a strange sight. Fossils of this ...