The park hosts a number of animal species, including mammals, birds, fish, reptiles, amphibians, and insects. There are also many exotic species within the park boundaries that were introduced to this area. The only threatened and endangered species known within the park is the Bald Eagle (Haliaeetus leucocephalus), which winters in the area. Endemic species found within the boundaries of the park include the Guadalupe Bass (Micropterus treculi) and the Texas Map Turtle (Graptemys versa). The Texas Horned Lizard (Phrynosoma Cornutum) was once common within the park and region and is now listed as a Texas Endangered Species.