In this combination photo, an American alligator(L) yawns and five turtles are seen at the National Zoo in Washington D.C., capital of the United States, March 13, 2012. <Photo: Xinhua/Wang Yiou>
In this combination photo, an American alligator(L) yawns and five turtles are seen at the National Zoo in Washington D.C., capital of the United States, March 13, 2012. <Photo: Xinhua/Wang Yiou>
