To rule out nutrient scarcity as a cause, he says you’d need to look not only at the quantity of food, but also the quality.

"It's almost like a biker gang convention. They just arrive out of nowhere, they cause havoc, they’re barking and belching,” ...

Killing the protected animals may be the only way to stop them from eating too many of the Pacific Northwest’s endangered ...

BROOKFIELD, Ill. -- Two California sea lion pups were born at the Brookfield Zoo in June. Their births were the first for this species at Brookfield in nearly 30 years, Chicago Zoological Society ...

The remote Galápagos Islands of the Pacific, about 600 miles off the coast of Ecuador, have no historic monuments, only a handful of human settlements and the barest smattering of amenities such as ...

CREDIT: Sven-Erik Arndt/Arterra/Universal Images Group via Getty Images. Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent ...