Ants Usually Turn Left While Exploring

A round 90 percent of humans are naturally right-handed. It's an example of what researchers call behavioral lateralization, an innate bias we're born with. Animals also demonstrate behavioral lateralization: Birds, if given a choice to fly left or right at a fork in a tunnel, have individual preferences that they almost always stick to. Rats, too, have a preferred direction when they twitch their tail or turn their head, especially when they’re stressed out.

http://www.smithsonianmag.com