Although guanine, a compound that occurs in guano, is used as a cosmetic ingredient, the industry does not harvest it from the guano. The FDA requires that any guanine used in beauty products is derived only from fish scales.

A mother bat will recognize her pup's specific sound and smell even among thousands of other pups.

Bats live on every continent except Antarctica. They are found almost as far north as the Arctic Circle and as far south as Argentina and the southern-most tip of South Africa.

Draculin (named after Count Dracula) is a glycoprotein found in the saliva of vampire bats. It functions as an anticoagulant, keeping the blood of the bitten victim from clotting while the bat is drinking. Draculin is currently being explored in medicine and may be useful as a treatment for strokes and heart attacks.