The Bracken Cave Preserve north of San Antonio is home to an estimated 20 million Mexican Free-tailed bats that are vital to our ecosystem.

The Phoenix bat cave offers a summertime home for Mexican free-tailed bats and a nightly show for visitors.

The Phoenix bat cave offers a summertime home for Mexican free-tailed bats and a nightly show for visitors.

Stock image of a Brandt's bat (Myotis brandtii). A viral video on Reddit shows a huge swarm of bats, possibly Mexican free-tailed bats, streaming out of a huge cave. iStock / Getty Images Plus ...

Deep in the heart of Texas, deep inside a cave, millions and millions of Mexican free-tailed bats roost together. One square foot of the cave's ceiling can contain more than 500 of them. When it ...

Mexican free-tailed bats fly out of Frio Cave, Texas, on April 6, 2024. Photographer Babak Tafreshi used a fish-eye lens and soft flashes to create this single-exposure image of 30 seconds.

In a new study, investigators analyzed whether Mexican free-tailed bats were a SARS-CoV-2 reservoir.

Mexican free-tailed bats are highly social and form large colonies such as the one in Bracken Cave. Hoary bats are also migratory, but they’re interesting because they don’t live in groups.

Each spring, millions of Mexican free-tailed bats fly from under the Congress Avenue Bridge, but they weren't always welcome like they are today.

Williams and a team of biologists from several agencies and universities have been tracking the annual migration of Mexican free-tailed bats, also known as Brazilian free-tailed bats, since 2008.

The Phoenix bat cave offers a summertime home for Mexican free-tailed bats and a nightly show for visitors.