London Zoo annual weigh in

Reuters
A Squirrel Monkey peers into a photographer's lens during a photocall at London Zoo

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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. (Getty)

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