Add Yahoo as a preferred source to see more of our stories on Google. California's sea otters have become surprising environmental champions by tackling a destructive invasive species wreaking havoc ...

Intelligence isn’t unique to humans — as the 15 videos of animals solving problems below are about to show you. The animal kingdom is packed with creatures that can solve complex puzzles, use tools, ...

When people think of intelligent animals, they immediately think of dolphins, elephants, and chimpanzees. But one of the most intelligent problem-solvers is hiding deep beneath the surface, called the ...