Bats are extremely beneficial for any ecosystem. Insectivorous bats are primary predators of night-flying insects, such as mosquitoes and various pests that harm crops and garden vegetables. A single brown bat can eat 1000+ mosquito-sized insects in one hour! Also, bat guano is valuable as a rich natural fertilizer.
Eighteen different species of bats have been reported in Colorado. While these bats are extremely beneficial to the environment, they are presently in danger of two major threats: losing their habitat, and suffering from white-nose syndrome, a fungus that is killing bats at an alarming rate. White nose syndrome began in New York state and is moving westward. Thousands of bats have died from this disease, and there is no known cause or cure. A single-chamber bat box is capable of housing up to 50 bats.