Saola (Pseudoryx nghetinhensis)The Saola Working Group calls this ungulate native to the mountains of Laos and Vietnam one of the rarest large animals on Earth. Citing habitat loss and poor ...

A critically endangered fox, called "one of the rarest mammals in the world," was recently caught on camera by a Northern ...

The Sierra Nevada red fox is an endangered species living solely in the Golden state and with less than 100 individuals living in the wild, according to the California Department of Fish and Wildlife.

A hidden camera in Queensland captures a rare encounter between a young northern wombat and an echidna, revealing valuable ...

A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding could upend what’s known of their evolution.