The world’s smallest monkey is called the pygmy marmoset, and it is, predictably, very tiny, just a little scoop of fur. It likes to eat the sticky resin found in tree bark, known as gum ...

But then, as these extraordinary pictures show, Kanzi is no man. He is a bonobo - pygmy chimpanzee - and his love of fire is challenging the way that we think about our closest relatives in the animal ...

Cactus ferruginous pygmy owls are named for the saguaro cactuses they live in, their rusty-colored stripes, and their small size. They’re as fierce as they are small: These 2.5-ounce raptors prey on ...