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 ...

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 ...

DESCRIPTION: The western pond turtle is a medium-sized turtle, reaching between 7 and 9 inches. Adult turtles have a yellowish belly, with dark blotches and black spots or lines found on top of their ...

Coquí frogs are cultural symbols in Puerto Rico, well known for the “ko-kee” call made by the common coquí, Eleutherodactylus coqui. In fact, 16 distinct species can be found on the island — and ...

Atrazine is one of the most commonly used herbicides in the United States: Approximately 80 million pounds of it are used across the country each year. It's a common contaminant of ground, surface and ...

Covering more than 25 million acres — about a fourth of California — the geologically diverse California Desert Conservation Area includes sand dunes, canyons, dry lakes, 90 mountain ranges, and 65 ...

The Sonoyta mud turtle has evolved as an aquatic species in one of the driest parts of the Sonoran Desert. With webbed feet and an innate ability to swim, this turtle depends heavily on what little ...

An analysis of oil and gas pipeline safety in the United States reveals a troubling history of spills, contamination, injuries and deaths. This time-lapse video shows pipeline incidents from 1986 to ...

The word jaguar comes from the South American Tupi and Guarani languages. A likely origin is the word yaguareté, meaning “true, fierce beast.” DESCRIPTION: The largest cat native to North America and ...

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 ...

Having collected the most recent census data from state and federal bald-eagle managers in each of the lower 48 states and the District of Columbia, the Center for Biological Diversity has determined ...