Grunion are known for their unusual mating ritual whereby at very high tides the females come up on to sandy beaches where they dig their tails into the sand to lay their eggs. The male then wraps himself around the female to deposit his sperm and for the next ten days the grunion eggs remain hidden in the sand. At the next set of high tides the eggs hatch and the young grunion are washed out to sea.
A related species the false grunion (Colpichthys regis) lives in the Gulf of California. Although the fish looks and acts similar, it does not have the same breeding method.
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