Max, an eagle owl, is weighed at 1.9kg during the annual weight-in ZSL London Zoo on August 21, 2014 in London, England. The height and mass of every animal in the zoo, of which there are over 16,000,... more 
Max, an eagle owl, is weighed at 1.9kg during the annual weight-in ZSL London Zoo on August 21, 2014 in London, England. The height and mass of every animal in the zoo, of which there are over 16,000, is recorded and submitted to the Zoological Information Management System. This is combined with animal measurement data collected from over 800 zoos and aquariums in almost 80 countries, from which zoologists can compare information on thousands of endangered species. (Photo by Oli Scarff/Getty Images) less 
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Getty Images | Photo By Oli Scarff/Getty Images
Thu, Aug 21, 2014 9:00 AM EDT