June 16 (UPI) --Summer is finally here, and humans aren't the only ones enjoying the warm weather -- snakes are slithering out of their dens in search of food, mates and, in some cases, mischief.

The motion of snakes has long fascinated humans: they undulate, they sidewind, they crawl, they even fly. Together with herpetologists, researchers in the Harvard John A. Paulson School of Engineering ...