When you visit Bali, you won't come across a cockatoo, but if you venture to the nearby island of Lombok, you will spot one. A similar situation applies to marsupials: Australia harbors a variety of marsupial species like kangaroos and koalas. However, as you head westward, their presence diminishes. While Sulawesi, an Indonesian island, is home to only two representatives of these distinctively Australian mammals, you'll be disappointed in your search for them on neighboring Borneo. On the other hand, Australia doesn't host mammals that are typically found in Asia, such as bears, tigers, or rhinos. The striking shift in the animal population's composition in this region was noted by the renowned British naturalist Alfred Russell Wallace, who not only co-discovered the theory of evolut...
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