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Sailfin Goby, Cozumel Mexico.

You place a mirror by a Goby in the sand by his hole. He sees himself but thinks it is another Goby trying to move into his area. Several things happen. The Goby turns from dark brown to a white spotted color, then pulls in his sail fin (to protect the fin in a fight), then flares his pectoral fins out and opens his moth like he is going to bite. He look like a small dragon.



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