If you've seen it in a horror movie, a bug probably did it first. To celebrate Halloween, here's a look at some of nature's ...

A behavioral ecologist explains the reciprocal social relationships vampire bats maintain, in sickness and in health.

During the rut, bull moose turn aggressive, as this Maine man found out when we narrowly escaped injury from a charging bull.

Third-biggest cat on Earth, muscular and low-slung, boasting one heck of a chomp, the jaguar reigns supreme atop the wild Neotropical food web. And while catching a glimpse of this burly beast ...