TOM DRAPER DESIGN; M. JOHNSON Wellcome Images (cell); NICK PARFITT Getty Images (zebra); DON FARRALL Getty Images (fish); DARLYNE A. MURAWSKI National Geographic/Getty Images (fly); DARRIN KLIMEK Getty Images (frog); MATTHEW WARD Getty Images (üger); DAVE KING Getty Images (elephant); GEOFF DANN Getty Images (chimpanzee); JOSE LUIS PELAEZ (human)
