The bats of Torrey Pines State Natural Reserve are rather rare because the wings are highly vascularized, and the low temperatures of the air lower the body temperature. The wing membranes are leathery and are spread between the third, fourth, and fifth digits, the forearm, the upper arm, and the hind leg. The thumb remains as a very small claw-like appendage on the front of the wing, and the hind foot still has distinct toes and claws on it. The Myotis Bats are the most common in the area. There are three or four species which are very difficult to identify, even when you have them in your hands. Larger bats that are seen will be either the Hoary Bat (Lasiurus cinerus) or the Red Bat (Lasiurus borealis). All the bats are insectivorous and nocturnal. Bats can serve as carriers for rabies and because of this, injured or sick bats should never be handled. This is a more complete list of bat species observed in the Reserve or nearby:

California Myotis (Myotis californicus)
Yuma Myotis (Myotis yumanensis)
Big Brown Bat (Eptesicus fuscus)
Hoary bat (Lasiurus cinereus)
Western Red Bat (Lasiurus blossevillii)
Mexican Free-tailed bat (Tadarida brasiliensis)
Pocketed Free-tailed bat (Nyctinomops femorosaccus)
Western Mastiff Bat (Eumops perotis)