How Animals Beat the Heat

A polar bear swims in the cooling waters of Moscow Zoo, on Wednesday, July 21, 2010. A heat wave hit central Russia breaking temperature records going higher than 30 C (86 F) for the last two weeks. Here's how he and other zoo denizens beat the heat.  (AP Photo/Misha Japaridze)

A polar bear dives into the water at Columbus Zoo and Aquarium in Powell, Ohio. Zoos across the country use shade, water and every conceivable form of cooling machine to help hundreds of thousands of animals, visitors and workers beat the heat every summer. (AP Photo/G. Jones, Columbus Zoo and Aquarium)

A polar bear bites an ice bar containing the apples at a zoo in Osaka, western Japan Friday, July 23, 2010. (AP Photo/Kyodo News)

Naba, a four-year-old female African lion, keeps cool by licking a "bloodsicle" made of frozen cow blood, at the National Zoo in Washington in 2008.  (AP Photo/Charles Dharapak)

An undated photo provided by Annemarie Ferrie for the Turtle Back Zoo shows an otter snacking on a "fishsicle" (fish in the middle) at the Turtle Back Zoo in West Orange, N.J.  (AP Photo/Turtle Back Zoo, Annemarie Ferrie)

Children watch as a polar bear escapes the heat with a swim at the Lincoln Park Zoo, in Chicago in 2005. Zoos across the country use shade, water and every conceivable form of cooling machine to help hundreds of thousands of animals, visitors and workers beat the heat every summer. (AP Photo/Brian Kersey)

Tian Tian, one of the National Zoo's pandas, checks out two fruit popsicles on a hot summer day at the zoo in Washington.  (AP Photo/Jacquelyn Martin)

Toba, a 34-year-old orangutan, as she enjoys a frozen treat at the Oklahoma City Zoo, in Oklahoma City in 2006.  (AP Photo/Sue Ogrocki)

George, a two-and-a-half-year old lowland gorilla, as he licks a frozen treat at the Oklahoma City Zoo, in Oklahoma City in 2006. (AP Photo/Sue Ogrocki)