Sep 14, 2025
Mosquitofish waving around their gonopodia By: Jane Burton From: The Mating Game 1976
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Mosquitofish waving around their gonopodia By: Jane Burton From: The Mating Game 1976
Mangrove killifish (Kryptolebias marmoratus) By: D. Scott Taylor From: Natural History Magazine 1989
Platy female (top) and swordtail male (bottom) By: New York Zoological Society From: The Science of Zoology 1966
Swordtails By: New York Zoological Society From: The Science of Zoology 1966
Male guppy swinging its gonopodium around By: Donn Eric Rosen From: Natural History Magazine 1962
Guppy courtship By: Donn Eric Rosen From: Natural History Magazine 1962
Tomeurus gracilis showing off its gonopodium By: Donn Eric Rosen From: Natural History Magazine 1962
Twospot livebearer (Pseudoxiphophorus bimaculatus) male and female, distinguished by their anal fins By: Donn Eric Rosen From: Natural History Magazine 1962