A new study investigates an ongoing epidemic in Bay Area peregrine falcons.

The pygmy long-fingered possum and the ring-tailed glider, two marsupials believed to have died out thousands of years ago, ...

For nearly two centuries, a small brown frog living in Southeast Asian rainforests was considered a single, well-understood ...

Learn about the fatal encounters between two groups of killer whales, bringing the idea of whale cannibalism into question.

The death of this ancient species, discovered alongside more newly described mammals, had been greatly exaggerated.

A plantation worker photographed this new genus of mammal in New Guinea, thought to have been dead for 6,000 years.

Mammals are not especially diverse. Roughly 6,800 mammal species are known to exist, compared with about 8,800 species of amphibian, 11,000 species of bird and 12,500 of reptile. Yet when most people ...

Two marsupial species thought long extinct, until now known only from fossils, were found alive in New Guinea through a collaboration of scientists, indigenous communities and citizen scientists ...

A new species of chiton — a tiny, armored marine mollusk from a lineage roughly 500 million years old — has been identified ...

A fire ant nest has been spotted at one of Australia’s most iconic World Heritage rainforests, sparking concerns about the ...

Without interrupting their busy sleep schedule, Australia’s cute, if cantankerous, koalas have turned a truism of genetics on its head. In short, the proliferation of certain koala populations shows ...

Earth’s vertebrate diversity may be far richer than anyone realized. A sweeping analysis of more than 300 studies suggests that for every known fish, bird, reptile, amphibian, or mammal species, there ...