Dolphins are quite abundant in some areas of the world. Off the coast of Japan, for example, populations of the white-sided dolphin, Lagenorhynchus obliquidens, are estimated at 30,000 to 50,000 individuals. In many species, schools of up to 1,000 travel together, while some species, such as the bottle-nose dolphin, tend to be found in smaller groups of less than 100, or even just a small family group. Solitary individuals are, however, rare.
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