Fish use their fins to attract mates

See:

http://www.practicalfishkeeping.co.uk/content.php?sid=3302

Article reads: Research published in the open access journal BMC Evolutionary Biology has shown that the male cichlid Pelvicachromis taeniatus, prefers females displaying a larger pelvic fin, and that this preference has driven females to grow pelvic fins that are out of proportion to their body size.

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