The smallest gray wolf subspecies in North America, the Mexican gray wolf is also one of the rarest and most imperiled mammals on the continent. The U.S. Fish and Wildlife Service (and its predecessor ...

Reaching up to 800 pounds and 8 feet tall when standing, grizzly bears boast tremendous size and physical strength and have almost no natural enemies. Or just one — humans. But we’ve proved formidable ...

At the Center for Biological Diversity, we believe that the welfare of human beings is deeply linked to nature — to the existence in our world of a vast diversity of wild animals and plants. Because ...

The first species ever to be emergency-listed as an endangered species in Canada, the Oregon spotted frog was on the U.S. candidate list for 23 years before it federal protection in the United States.

Mojave fringe-toed lizards have numerous traits tailored to their sand-dwelling lifestyle. Foremost are the lizards' scaly hind toes, which resemble snowshoes and keep them from sinking as they sprint ...

Like the polar bear on the opposite pole, the emperor penguin endures almost unfathomable hardships to breed and nurture each new generation — fasting for months through the planet's harshest winter ...

For every county in the United States, the map below shows information on all the animals and plants protected under the U.S. Endangered Species Act as threatened or endangered. To see the number of ...

Thanks to their sand-colored plumage and stop-and-go dashes across dunes, piping plovers are usually identified by their bell-like whistles before they're seen. But these birds' camouflage techniques ...

The genus name Ochotona stems from the Mongolian word for pikas, ochodona. The species name princeps comes from the Latin word for chief, referring to the Chipewyan Indian name for the pika: “little ...

With adults only about an inch tall, the dwarf seahorse is the smallest of the four seahorse species found in U.S. waters. This dainty, curly-tailed fish occurs only in shallow seagrass areas in the ...

The mountain yellow-legged frog was once the most abundant amphibian in Southern California's Sierra Nevada and Transverse Ranges. Just decades ago, it was hard to walk around many of California's ...