Paul Donn (R) and Frank, two Western Lowland Gorillas, inspect the damage done to a birthday cake placed in the gorilla exhibit at the San Diego Zoo in San Diego, California, September 4, 2009. The cake, made of ice, bamboo and banana stalk, included a number '1' on top in celebration of the first birthday of Frank, the Zoo's youngest gorilla. The San Diego Zoo is home to 13 Western Lowland Gorillas. REUTERS/Ken Bohn/San Diego Zoo/Handout (UNITED STATES ANIMALS ENVIRONMENT SOCIETY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS