Following at the rear is a track left by its long, thin tail. Scientifically known as Peromyscus sonoriensis, the western deer mouse weighs less than one ounce. Nonetheless, it is a mouse that roars.

The pygmy mouse lemur is the smallest primate in the world. Its head and body are less than two and a half inches long, though its tail is a bit more than twice that length. These threatened ...

Dinosaur fossils discovered by paleontologists working with the University of Wisconsin-Madison have been determined to be ...