Weigh-in day

Giraffes prepare to be weighed and measured during the ZSL London Zoo's annual weigh-in in London, England. The height and mass of every animal in the zoo, of which there are over 16,000, needs to be recorded. The measurements are collated in the Zoological Information Management System, from which zoologists can use the data to compare information on thousands of endangered species. Oli Scarff, Getty Images
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