A lemur species called aye-ayes have very long, thin middle fingers that allow them to reach into holes in trees and dig out bugs to eat.

The aye-aye’s long, thin middle finger helps it reach insects hidden in tree holes, so it improves the animal’s ability to find food. A helpful inherited feature that suits an organism to its environment is an adaptation. Variation means differences among individuals, while overpopulation means more individuals than the environment can support.

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