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The mudskipper is a fascinating animal, in that it's a fish that both swims in the water and crawls on the land. It's probably not unlike the prehistoric fishes that first ventured out of the ocean, hundreds of millions of years ago. Looking at it, you might think that its two pectoral fins do all the work when it's out of the water, while its tail just flaps around. By building a robotic version of the mudskipper, however, scientists have learned that its tail plays a crucial role while it's on the land – the finding could have implications for the design of walking robots.
