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London Zoo Animals Tip the Scales at Annual Weigh-In

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.

Keeper Jack Sargent measures Perry, a 6-foot llama, during the annual weigh-in at ZSL London Zoo on Aug. 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.

Oli Scarff / Getty Images Europe

Kumbuka, a Silverback Western Lowland Gorilla, is measured at 7 feet during the annual weigh on Aug. 21.

Oli Scarff / Getty Images Europe

A "jungle nymph" is measured during the annual weigh-in at the London Zoo.

Oli Scarff / Getty Images Europe

A keeper weighs a mossy frog in a weighing spoon during the annual weigh-in at ZSL London Zoo.

Carl Court / AFP

A squirrel monkey grabs food left on scales by a zookeeper during the annual weigh-in.

Carl Court / AFP

Zookeeper Dave Clarke poses with one of the world's smallest and rarest snails, a Partula Snail, while weighing one of the largest in the world, an African Land Snail, at London Zoo on Aug. 21.

Toby Melville / X90004

Max the owl is weighed.

Facundo Arrizabalaga / EPA

Perry the llama is measured at the London Zoo on Aug. 21.

Facundo Arrizabalaga / EPA