Kori Bustard Chicks (IMAGE) Smithsonian Caption A biologist at Smithsonian's National Zoo holds two kori bustard chicks on June 26, 2007. The chicks, Pipe and Tuza, hatched at the zoo June 23 and 24. Kori bustards are the world's heaviest flying bird and the chicks could grow to be as large as 35 pounds. The species, native to eastern and southern Africa is in decline and faces threats to its survival. The National Zoo is one of two zoos in the nation consistently breeding kori bustards in hopes of guaranteeing a secure future for them. Credit Jessie Cohen, Smithsonian's National Zoo Usage Restrictions Please include the photo credit when using: Jessie Cohen, Smithsonian’s National Zoo License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.