Colossal’s bold announcements have drawn criticism from many scientists, but the billion-dollar firm is not backing down.

The established conservation practice of relocating animals from large, genetically diverse populations to small communities ...

This is often cited as the first example of de-extinction. However, the only preserved tissue was from one female animal, meaning it could not have been used to bring back a viable population.

Gene editing may hold the key to rescuing endangered species—not just by preserving them, but by restoring their lost genetic ...

The largest-ever study of over 2.6 million zoo birth records reveals skewed sex ratios in endangered species, from lemurs to ...

In living animals, we can simply observe what they feed on today. In the case of extinct species, however, researchers rely on morphological or chemical information supplied by fossils.

Scientists confirmed the rediscovery of a tiny gecko species once thought extinct on Rábida Island in the Galápagos.

How it moved, though, is anyone’s guess, for no modern-­day animal resembles this bulbous critter. A fossil of a pleurocystitid, an extinct aquatic animal that lived some 450 million years ago.

Arizona is home to unique and rare creatures including jaguars, ocelots and condors. However, 48 species are endangered or threatened. See the list.