Dugong

 

The dugong is a large marine mammal found in the warm waters surrounding Indonesia and Australia. Although the dugong can be found widely throughout the Indo-Pacific tropics, the highest population of the dugong is concentrated around northern Australia.

Although the dugong looks extremely similar to a manatee, the two are different species. The dugong and the manatee are very closely related and can look almost identical until you look at their tail. The tail of the dugong is typically forked like the tail of a shark, where the tail of the manatee is broad and flat, and slightly more flipper looking than fin looking.