SLIDESHOW: Amazing zoo animals around the world
Heat Wave
Credit: AP
As temperatures reach three digits, Fitz and Jontu, the two Indian rhinos at the Henry Doorly Zoo in Omaha, Neb., cool off Wednesday, July 20, 2011, in a mud pit. The heat "dome" sitting over much of the U.S. is caused by a huge area of high pressure that's trapping and compressing hot, humid air from the Gulf of Mexico beneath it and pushing the jetstream, and thus cooler, drier air, far northward into Canada. (AP Photo/Nati Harnik)
