The female Amur leopard was recently shot and beaten, conservation groups announced, further lowering the wild numbers of the world's rarest big cat.

Fish are fattening up faster near the Pacific's surface, which is warming, while species in the deep sea are growing more slowly as that water cools, a new study says.

Floating trash is as common in the oceans today as driftwood, scientists say, and plastic debris is taking its toll on animals from albatrosses to sea turtles.

In an unusual conservation partnership, a palmlike plant offers protection to a brilliant green lizard as it pollinates Mauritius' threatened Trochetia flower.

The Amur leopard, the world's rarest big cat, is down to 25 to 34 individuals—at least 66 fewer than is needed for survival, experts say.

An Australian lizard has been found to change from male to female while still in the egg during extreme heat, challenging one of the core concepts of biology, scientists say.

Witness the bizarre display of the marvelous spatuletail, a tiny bird that uses a pair of extra long feathers to wow potential mates.

Global warming may strengthen a weather pattern that's known to decrease hurricanes, contrary to recent predictions that warming will worsen storms.

The New Mexico waterway is the most at risk on a "top ten" list of rivers defined by a conservation group as most in need of aid during the coming year.

A pair of newfound tree fossils is providing scientists unprecedented insight into what the world's earliest forests looked like.

In contradiction to a 2005 UN report, a new study of abnormalities in barn swallows suggests that fallout from the explosion is still putting millions of people at risk.

A hotter, wetter climate may be responsible for the sharp drop in more than a dozen species of lizards and frogs in Central America, according to a new study.

At least 7.8 million sharks and thousands of seabirds and sea turtles are killed off southern Africa each year by hooks meant for other animals, a new study says.

Eagle-eyed fans watching a live video feed were the first to spot the baby bird, which hatched despite fears that the Maine weather had irreparably damaged its egg.
Updated April 20: Baby eagles confirmed dead after storm.

The West's landscape is changing, as more ranches come under the control of environmental groups and "weekend ranchers" seeking to preserve traditional rangelands.