I voted no, but then I remebered I saw a bunch by the Colorado River right on the CA/AZ border. On the California Side right across from Parker, AZ.
Theres a lot of these things called Burros (like mules) that wander all around. I'm sure they always get hit by cars and the Condors feast. Plus, a lot of stuff must die in the arid 115 degree desert in the summer.