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fins
A fin is a surface use to produce lift and thrust or to steer while traveling in water, air, or other fluid media. The first use of the word was for the limbs of fish, but has been extended to include other animal limbs and man-made devices.
Trivia about fins
Ichthyosaurs swam by undulating; plesiosaurs, mainly by moving these
Unlike most fish, morays lack scales & the caudal, pelvic & pectoral types of these appendages
The tripod fish uses elongated these to support itself, appearing to stand on the ocean floor