Are box turtles in worse shape than herpetologists thought? University of Toledo researchers raise the question in new ...

Koalas suffered a massive population decline that left them with dangerously low genetic diversity. However, new genomic research suggests their rapid rebound may be helping reverse some of that ...

Researchers have revealed that North American birds are declining at an accelerating rate in three regional hotspots ...

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species.

Though previous research has shown that bird populations are declining across North America, a new study is the first to show that the pace of loss has picked up speed since the mid-1980s in three ...

Billions of birds that once filled North American skies have disappeared, and new science shows they are disappearing faster than ever.

The United States has enjoyed some level of population growth virtually every year for more than a century. But that doesn't mean every state is always growing in lockstep. Here's a for-instance: ...

A declining population can wreak havoc on a country whose various social programs are based on growing numbers of citizens. For instance, the Social Security system in the U.S., and similar ones in ...