The ocean is home to a vast array of different animals, each with its own traits. These include different forms of mating, ...

Evolution has so precisely honed certain specialized muscles involved in fish mating calls that the muscles are now physically incapable of much else, including any significant locomotion, biologists ...

A biologist at Washington University in St. Louis has shown that for some fish species, females prefer males with larger sexual organs, and actually choose them for mating. That does not exclude males ...

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"Each spring, all adults of the species migrate to one site, the Colorado River Delta in the uppermost portion of the Gulf [of California], to form one spawning aggregation of several million fish," ...