While insects provide an essential food source for many vertebrate species, they're more than just a protein-laden snack. Chimpanzees use them to sterilize wounds, and herons use them as fishing bait. Sloths rely on moths to maintain the algae in their fur, which they then eat. Birds and reptiles lay their eggs inside the temperature-controlled sanctuary of termite mounds, while some desert frogs reside in ant nests because of the humidity.