Across the skies of North America, scientists are watching a troubling pattern unfold: millions of birds are arriving lighter ...

Veterinarians and researchers gathered in Fort Worth this week for a summit on a stealthy killer that strikes mostly young ...

Long-buried traces of Denisovan DNA have resurfaced in modern human genomes — and they may still be working for us today.

Think about the last time you saw a spider scurrying across your floor or a snake slithering through the grass. Your heart ...

New research has overturned decades of uncertainty by showing that Nanotyrannus was a fully grown predator, not a juvenile T. rex.

Mountain lions are one of North America’s most beautiful feline predators. These big cats are known by many names, including cougar, puma, and panther. Mountain lions survive on stealth, roaming an ...

Although the science is unsettled, the White House has embraced core tenets of the ‘sperm count decline hypothesis.’ ...

Goetze: Over the past few weeks, I’ve heard and seen some annual winter residents slowly flying and gliding into the area.

Just like human babies, puppies need plenty of sleep — much more than adult dogs. After all, this is the time when their ...

Bringing down an elk, buffalo or musk ox, let alone a human, does not present much of a challenge. Luckily, they tend to ...

For decades, U.S. marriage rates have been on the decline while the average age at which Americans have children has risen.

The person was an older adult with underlying health conditions, officials said. The first human to have ever been infected with the H5N5 strain of bird flu has died, Washington state health officials ...