"An overview of 10 terrifying animals that are now extinct. From gigantic predators to bizarre creatures, these beings once roamed the Earth but are gone today.

Earth has witnessed a parade of unique creatures over millions of years, from predators to ancient giants. These creatures, once rulers of land, sea, and sky. They left behind fossils which can be ...

Reintroduction of captive-bred animals has had mixed success. This California butterfly lost habitat to grazing and drought and is considered to be extinct. The last live one was seen in the wild ...

Every lost species threatens to unravel ecosystems and in the process reduce the services they provide. “It’s not too late to stop more plants and animals from going extinct, but we have to act fast,” ...

The purpose: to capture for posterity species that someday might be extinct ... nearly 10,000 animals in the Ark. He plans to keep going to 15,000, which could take another 10-15 years.