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Tidbit:
The Mexican free-tailed bat (Tadarida brasiliensis) is a medium sized bat. Their bodies are about 9 centimeters in length, and they weigh about 15 grams. Their ears are wide and set apart to help them find prey with echolocation. Its fur color varies from dark brown to gray.
Mexican free-tailed bats live in caves in the southern United States, Mexico, Central America, the West Indies, central Chile and Argentina. Their colonies are the largest congregations of mammals in the world! The largest colony is found at Bracken Cave, north of San Antonio, Texas, with nearly 20 million bats. The bats of Bracken Cave can eat up to 250 tons of insects per night!