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The happiest animal on Earth -- Quokkas are one of the cutest and sweetest animals I've ever seen. But unfortunately, these teddy-bear sized treats are exclusive to the Rottnest Island of Australia. Quokkas are herbivores who spend most of their time munching on leaves, and other plant parts. While they are technically "wild" animals, I don't think I would mind keeping one of these lovely creatures in my home especially with their cute personality.