There are many reasons why researchers are concerned about endangered species. After all, these species went extinct in just the last decade.

The recent claim the long extinct dire wolf was resurrected made headlines around the world. But bioethicists and ecologists say there are ethical concerns.

A Lazarus taxon is a species that was once thought to be extinct, then unexpectedly reappears: Here's 11 of the most famous among them.

A biotech company says it has bred three animals with key physical features of the dire wolf — a species that has been extinct for more than 12,000 years. Colossal Biosciences says it used novel ...

Tens of thousands of years ago, during the late Pleistocene, many large animal species were simply erased from the planet during a widespread extinction. In Australia, nearly two dozen kangaroo ...

From an Australian frog that swallowed its own eggs to woolly mammoths, scientists could soon bring back long-lost species from the dead.

Isolation allows creatures to thrive as their relatives perish due to the threats present on much larger landmasses ...

Several species were wiped out due to overfishing, invasive species, and habitat destruction. By 2020, multiple species were officially declared extinct. Cryptic Treehunter Credit: X ...

A startling 24% of freshwater animals were at risk of extinction due to compounding threats from pollution, dams, water extraction, agriculture, invasive species, climate change and other disruptions.

Colossal Biosciences said it used ancient DNA from the extinct species to create three dire wolf pups named Romulus, Remus and Khaleesi.

At least two species were considered extinct — including the just-rediscovered Shortnose — and several other species no longer appear in several lakes.