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A 40-gram Waxy Monkey Frog is weighed at the London Zoo, Aug. 21, 2013 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.
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Max the Eurasian eagle owl on the scales at the London Zoo, Aug. 21, 2013.
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A 625-kg Bactrian Camel on the scales at the London Zoo, Aug. 21, 2013.
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Photographers photograph 1.9-kg Max the Eurasian eagle owl on the scales at the London Zoo, Aug. 21, 2013.
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A 400-gram African Bull Frog is put on the scales at the London Zoo, Aug. 21, 2013.
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Tammy, a 6.8-kg South American Tamandua, on the scales at the London Zoo, Aug. 21, 2013.
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A 45-gram Jungle Nymph on the scales at the London Zoo, Aug. 21, 2013.
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A 40-gram Waxy Monkey Frog is weighed at the London Zoo, Aug. 21, 2013.
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A 500-gram Giant African Land Snail on the scales at the London Zoo, Aug. 21, 2013.
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A 600-gram Royal Python is put on the scales at the London Zoo, Aug. 21, 2013.
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A 600-gram Royal Python sits on the scales at the London Zoo, Aug. 21, 2013.
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A 400-gram African Bull Frog is put on the scales at the London Zoo, Aug. 21, 2013.
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Alberta the 444-gram Tawny Owl on the scales at the London Zoo, Aug. 21, 2013.
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A 40-gram Waxy Monkey Frog is weighed at the London Zoo, Aug. 21, 2013.
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Keepers attempt to measure Sumatran Tiger JaeJae for the first time at the London Zoo, Aug. 21, 2013.
