This button quail chick is truly as cute as a button, and as a bonus, it can fit perfectly in the palm of your hand.

When you think of animal intelligence, what comes to mind? You might picture a clever dog fetching the newspaper, or a parrot ...

Researchers believe that Matschie's tree kangaroos are fairly solitary animals. Females and males have non-overlapping home ranges, but a male's range will overlap several females' range.

These solitary animals live alone, and in May and June females give birth to litters of one to six kits that they raise alone. The young are able to survive on their own by fall.

Hummingbirds are so fiercely territorial that fights between them are sometimes fatal. But one unusual species is living ...

While regeneration has long been the domain of colonial tunicates, a solitary species of sea squirt was able to regenerate into multiple, fully functional individuals within a month of being cut up.

What do you get when two stoats meet for the first time as babies? A lot of screeching and playing, which is key for their growth.