Trogloxenes Cliff swallows and cave swallows build their nest of mud along the rocky ledges of the cliff. Pack rat homes are mounds of sticks and bark. Inside the cave they nibble on animal bones and other bits of food. They mark their trails when leaving in order to memorize the route back. Bats are probably the most common known trogloxene or cave guest.
Most caves are the host area for thousands of bats.
They use the caves during the winter to stay warm and raise their young. They are found near the entrance. The Mexican free-tailed bats may go up to an altitude of 3,000 meters and travel hundreds of miles to feed on insects. Bats use a combination of spatial memory, personalized calls, and personalized odors to identify their young from the millions of other young bats. Bats migrate from the caves during the summer months.