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No, it's not photoshopped--that dolphin's fin really is on backward. It is a type of spinner dolphin that lives in the eastern tropical Pacific

By Ewen Callaway of Nature magazine New descriptions of Australopithecus sediba fossils have added to debates about the species' place in the human lineage.

The thick, waterproof fur that once made the platypus ( Ornithorhynchus anatinus ) a valuable target for trappers may soon present another danger for the unique mammal: Australia could soon end up being too hot for the species to survive. [More]