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As depicted by this GIF, a dolphin moves its tail in a fluid up and down motion while it is swimming, however, the center of it's body and it's head move very little only slightly tilting up and down with each tail movement.
As depicted by this GIF, a dolphin moves its tail in a fluid up and down motion while it is swimming, however, the center of it's body and it's head move very little only slightly tilting up and down with each tail movement.