Bats, the only flying mammal, are incredibly important species that unfortunately sometimes have a bad reputation. Many bats find pest insects to eat by using echolocation, while others aid pollination of flowers and crops. Their feces, called guano, acts as a good fertilizer. Bats are found in almost every kind of habitat, though they generally prefer warm weather and will hibernate through winter in certain areas. An example of a bat in Massachusetts is the Northern Long-eared Bat. The main threats facing this species group are disease, most notably white-nosed syndrome; habitat loss; pollutants such as pesticides and insecticides; and humans, with fear of bats causing people to destroy bat roosts (where bats sleep) or hurt bats that they find ¹.