Types of Bats in Miami Although over a dozen species of bats occupy the state year -round, only five of them live in Miami, FL. Many of these are relatively similar in appearance but differ in size, habitat, and behavior. The most common species in Miami neighborhoods is the Brazilian free-tailed bat, while the largest and rarest is the Florida bonneted bat. These pests get their name from their large ears, which slant forward and cover their eyes. Other varieties include northern yellow bats, Seminole bats, and evening bats. Why Are Bats Dangerous? Bats are helpful in eliminating insects, but they can be dangerous to residents. While the pests naturally roost in caves or trees, they also invade man-made structures, such as attics and walls. Droppings, called guano, pile up quickly when bats live indoors. This creates a serious health hazard, since exposure to guano can cause histoplasmosis. If untreated, this life-threatening fungal disease may damage the lungs and other organs. Bats in Miami can also be carriers of rabies, though transmission of the virus from bats to humans is rare. Detection and Control of Bats To avoid the dangers these pests bring into homes, Miami residents should be aware of the signs of bats. Because they are nocturnal, bats make squeaking and scratching sounds as they move around during the night. Additionally, guano on walls indicates that a colony is nearby. If bats are found indoors, safely eliminate the problem by contacting the professionals at Critter Control.