LONDON, ENGLAND — AUGUST 22: 'Elton' the spectacled фото

LONDON, ENGLAND — AUGUST 22: 'Elton' the spectacled owl is weighed and measured during ZSL London Zoo's annual weigh-in on August 22, 2012 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.