Bats play a crucial role in many ecosystems around the world. They keep insect populations in check by eating bugs—mosquitos in particular—by the ton each night. Without them, farmers would have to pay for more pesticides to keep their crops safe. Bats also serve as pollinators for hundreds of plants, from bananas to the agave plants that give us tequila. These and other factors make the spread of white-nose syndrome a huge concern for humans.