Mexican free-tailed bats emerge from North Campbell Ave. bridge over the Rillito River July 12, 2008. The bats take flight just after sunset to feast on insects.

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Five hundred baby free-tailed bats can cluster in 1 square foot. A mother Mexican free-tailed bat can find her baby in huge colonies in which millions of babies are gathered.

National Express offers free coach travel for up to three children (15 and under) per adult this summer.

Federal officials say famed Mexican boxer Julio César Chávez Jr. has been arrested and will be deported to Mexico, where he faces organized crime charges.

The largest caves are Kickapoo Caverns and the Stuart Bat Cave, home to Mexican free-tail bats. The 3-hour wild cave tour explores the undeveloped cave.

Fungus discovery on Mexican free-tailed bats shocks biologists The fungus linked to the deadly white nose syndrome in bats is moving south and has spread to a non-hibernating species.