London Zoo is one of the largest zoos in the world, founded in 1828 for scientific research. It houses many rare species, including kangaroos that carry their young in pouches, sharks that are very large and feed on plankton, and crocodiles that live in Africa and feed on fish, frogs, and meat. The zoo is also home to piranhas from the Amazon, tapirs that resemble pigs with trunks, pandas that eat bamboo, and koalas and lemurs from Australia and Madagascar respectively.