We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.

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 ...

Why are bats dying in North America? An estimated 6.7 million bats have died since 2006 because of an outbreak of white-nose syndrome, a fast-moving disease that has wiped out entire colonies and left ...

Bluefin tuna are an ocean-going fish that grow up to 10 feet long and can weigh as much as 1,200 pounds. Unlike almost all fish, bluefin tuna are warm-blooded and able to regulate their body ...

Once among North America’s most widely distributed land mammals, gray wolves have also been among the most persecuted. State, local and private bounties and a federal extermination program nearly ...

The vast majority of western dry forests are at risk of large, high-intensity fire because of the effects of poor forest management over the past century. The primary factors that lead to current ...

DESCRIPTION: Steelhead can reach up to 35 pounds in weight, though average size on the central California coast is generally smaller. Steelhead are usually dark olive in color, shading to silvery ...

Description: The tallest land mammal, with a neck as long as 6 feet, the giraffe is also well known for the unique brown and white pattern on its coat (“pelage”) and its lengthy eyelashes and legs.

The grizzly bear is so named because its hair is grizzled, or silver tipped, yet the name is commonly believed to be derived from “grisly,” meaning “horrible.” DESCRIPTION: A subspecies of brown bear, ...

2000 B.C. – Environmental problems from lead mines first documented 400 B.C. – Hippocrates accurately describes the symptoms of lead poisoning 476 A.D. – Roman Empire collapses; lead use in water ...

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 ...

Even with its big, conspicuous ears and relatively long legs, the slender-built San Joaquin kit fox is the smallest member of the dog family in North America. Historically, this kit fox was widely ...