Freezing temperatures in Texas are having a devastating impact on the city's wildlife, including its largest bat colony. To save them, Mary Warwick, the Wildlife Director of the Houston Humane Society, has been going down to the bridge with a flashlight and collection box to rescue the cold-stunned bats. She then brings them back to be rehabilitated and placed them next to a heat source to raise their body temperature. Warwick, city's only bat rehabilitator plans to go keep going back to bridge until the freeze ends. Warwick says the bats are important to the ecosystem because they eat pests such as moths and mosquitoes.