Insect eaters are animals that feed on insects as their primary source of food. The three most common insect eaters are bats, toads, and mantises. Bats are small, nocturnal mammals that use echolocation to find their prey. Toads are amphibians that have a wide range of diets, but they often feed on insects. Mantises are predatory insects that feed on other insects. All three of these animals are important in controlling insect populations.