Three out of every four of the 500 North American bird species are in decline, a recent study found. But unlike the mass extinctions that killed off the dinosaurs, this one is driven by us.

Grizzly 1058’s mother was Grizzly 399, a well-known bear that also lived in Grand Teton National Park. After Grizzly 399 was ...

A research team has created a comprehensive evolutionary tree of all bird species, integrating data from hundreds of studies ...