San Diego Zoo is one of the biggest zoos in the world keeping 3700 animals, 650 species and subspecies. Animal treatment there is very progressive. For example, there are around 40 varietes of bamboo to feed pandas and 18 varieties of eucalyptus for koalas. There is even a joke about it in Madagascar (2005 computer-animated comedy): animal protagonists find themselves on the island, at first glance see snow-white sand, beautiful nature and no cages and they think that they are in San Diego Zoo.