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Keeping cool at the Belgrade zoo

Ivan Milutinovic / Reuters

A zookeeper sprays water on a polar bear to help it cool down at Belgrade's zoo July 13.

Ivan Milutinovic / Reuters

Children watch as water is sprayed on an Asian elephant to help it cool down at Belgrade's zoo July 13.

Ivan Milutinovic / Reuters

A zookeeper sprays water on a hippopotamus to help it cool down at Belgrade's zoo July 13, 2011 as an intense heat wave sweeps Serbia with temperature reaching 104 degree Fahrenheit (40 degrees Celsius).

It must be hot for a polar bear in that kind of heat. I'm guessing zoos across the Midwest and Northeast United States will be doing the same thing today as a heat wave continues there.

See more animals in our new Animal Tracks blog.