Here's a cool exercise for bird watchers. Avian Sleuth: Call of the Wild is a series of interactive landscapes where, armed with your mouse, ears, and a pair of binoculars, you scower the bushes and trees trying to pinpoint the location of a variety of hidden birds. Invisible at first, you can try to identify them first by their call or more likely use the binoculars to scan the view and zoom in on the nearest bird shape. Once you focus the bird into a clear image, you can then look him up and correctly select the species from the list. With three difficulty levels, the game is fun for all ages.