A Nebraska zoo is telling guests to not throw coins into animal exhibits. Veterinarians at Omaha's Henry Doorly Zoo and Aquarium said an examination of one of its alligators revealed foreign metal objects in its stomach. Thibodaux, the zoo's 36-year-old leucistic American alligator, underwent a veterinary procedure to remove the metal objects before they caused any problems. The zoo said the procedure identified 70 U.S. coins. Zoo officials said all of the coins were successfully removed, which was confirmed with a follow-up X-ray image, and Thibodaux was able to recover and return to his habitat.