Two species of teleost fish, grunion are famous for their unique mating behavior. During high tides, female grunion crawl out along the water's edge and dig their tails into the wet sand. The males then wrap themselves around the female to mate and the eggs are deposited in the sand. During the next set of very high-tides, the eggs hatch and the baby grunion wash out to sea. They are native only to California and Baja Mexico.
California Grunion, Leuresthes tenuis
More info is available at Grunion.org. Another, better video is available with ads on CNN.
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