There are a dozen or so species of blood-sucking flies that plague white-tailed deer. There is little a deer can do to defend themselves from these biting fly attacks.
But what is a painful nuisance to a deer is also a dinner buffet for bats. In a new study, researchers report numerous instances of insect-eating bats feeding on the swarms of flies attracted to white-tailed deer.
Read my post about it here: Bats Provide Pest Control Services to Deer.