Opossum
The site, however, also includes other, much different areas. To the north, south, and west, the open prairie gives way to dense thickets of mesquite, acacia, and thorny undergrowth that crown low rises and are believe to have inspired the name Palo Alto-or tall trees. The park is also criss-crossed by a series of shallow ravines, known as resacas. The resacas once formed the bed of the ever-shifting Rio Grande. Although they remain dry for much of the year, occasional heavy rains create small pools in these former river channels and spurs the growth of reedy plants that thrive in marshy areas.
This assortment of habitats also supports a variety of animal life. Coyotes, jackrabbits, and bobcats roam the open plain. Javelina, opossums, tortoises and many otheranimals find refuge in the cover of brush. Rattlesnakes, scorpions, and fiddler crabs can be found in burrows under the ground while dozens of different kinds of birds, including raptors and tropical species can be spotted on their perches in tree branches.