Before the Spanish introduced modern horses to the New World, horses roamed wild in North America, then they disappeared, but ...

“Scientists estimate that we’ve identified only one-tenth of all species on Earth,” said Dr. Shannon Bennett, chief of science at the California Academy of Sciences, in a statement.

Practitioners of transpecies design aim to consider the needs of all species — not just humans — in the built environment. June 16, 2025. contribute now. Public media funding.

So new species are being discovered all the time - and often by citizen scientists, not academics. From member station KUNC in Colorado, Rae Solomon reports. (SOUNDBITE OF FOOTFALL ON TRAIL) ...

And experts think there are as many as 34,000 fish species — more than all other vertebrate species combined. With over 3,000 of these, the Cyprinid order, which contains freshwater fish such as ...

In the process, we lost 85% of all marine species. But that was nothing compared to “ The Great Dying ,” a nickname given to the Permian-Triassic extinction , where 96% of species were lost .

In honor of National Endangered Species Day, take a look at some of the creatures that can be found in the U.S., both on land and sea, and learn some interesting facts along the way.