National Geographic : 1967 Jan
Buttoned up like a submarine, a 14-inch youngster swims by wriggling its tail. Valves close nostrils, windpipe, and ears under water; in floating trim (below), gators show only eyes and nostrils above the surface. Leaping "Le Roy," a pet gator, rears on its tail for a tidbit of raw meat. Only the young display such dexterity out of water. Long rear legs in dicate that the alligator's ancestors walked up right like many of their dinosaur kin.