Photo of Drs. Handley and Kalko

The Smithsonian Bat People

Dr. Charles Handley, a curator of mammals at the Museum, has been observing bats for nearly 40 years. In 1975, he began a study of the bats on Panama's Barro Colorado Island, a field station of the Smithsonian Tropical Research Institute. On this 15.5-sq-km (6-sq-mi) island, Handley and his associate, Dr. Elisabeth Kalko, estimate there are 15,000 fruit-eating bats and thousands of insect-eating bats that together represent at least 60 species.

How Can So Many Bats Coexist?
Handley and Kalko say it's partly because bats have specialized diets. Different species eat insects, blood, small vertebrates, fruits, or nectar and pollen. In a 10-year study of fruit-eating bats, they found that where several species in a community eat the same fruit, each relies on a different hunting technique or fruit size. Big bats eat large fruit, little bats the smaller fruit. One species sniffs out figs beneath leaves, while another uses high-frequency sound waves, or echolocation, to detect fruit dangling in the open.

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