Police and the Memphis Zoo searched Thursday for a wallaby that was missing after heavy rain caused flooding inside an exhibit. The zoo said a creek in its KangaZoo exhibit overflowed during thunderstorms Wednesday, leading staff to evacuate animals to an animal hospital. After counting the animals, staff found that one wallaby was missing, and a search began, the zoo said in a news release. The Memphis Police Department is helping search for the missing wallaby, which are smaller relatives of the kangaroo and are fairly skittish, the zoo said.