Energy

"Evolution has endowed the big-footed snowshoe hare with a particularly nifty skill. Over a period of about 10 weeks, as autumn days shorten in the high peaks and boreal forests, the nimble nocturnal hare transforms itself. Where it was once a tawny brown to match the pine needles and twigs amid which it forages, the hare turns silvery white, just in time for the falling of winter snow. This transformation is no inconsequential feat. Lepus americanus, as it is formally known, is able to jump 10 feet and run at a speed of 27 miles per hour, propelled by powerful hind legs and a fierce instinct to live. But it nonetheless ends up, 86 per cent of the time by one study, as a meal for a lynx, red fox, coyote, or even a goshawk or great horned owl. The change of coat is a way to remain invisible, to hide in the brush or fly over the snow unseen, long enough at least to keep the species going."