The world’s rarest mammals, including the vaquita, Javan and Sumatran rhinos, Amur leopard, saola, Hainan gibbon, northern ...

Hidden in dense forests, icy mountains, and remote oceans, these animals have mastered the art of staying unseen.

A rare sighting on a trail camera has given conservationists hope that a critically endangered animal is still growing its herd. In early March, a trail camera located in Ujung Kulon National Park in ...

Often called the Asian unicorn, little is known about the enigmatic saola in the two decades since its discovery. None exist in captivity and this rarely-seen mammal is already critically endangered.© ...

Q. I get different answers on the Internet when I ask what is the rarest animal in the world. What’s the correct answer?

The two-week-old pine marten was handed in to a wildlife hospital on April 21 weighing just 105 grams. The tiny kit was found ...