Zookeeper Dave Clarke poses for a photograph 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 ... more 
Zookeeper Dave Clarke poses for a photograph 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 in central London August 21, 2014. The annual weigh-in, which includes waist and height measurements, is conducted for the general wellbeing of the animals, and to help detect pregnancies in endangered species, as part of the Zoo's international breeding programmes. REUTERS/Toby Melville (BRITAIN - Tags: ANIMALS ENVIRONMENT) less 
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Reuters | Photo By TOBY MELVILLE / REUTERS
Thu, Aug 21, 2014 8:38 AM EDT