reach speeds of up to 16 - 17.5 km/h when in danger.

There has been a record of rather aggressive interspecies interactions between a North Pacific right whale and a pod of gray whales off California, making it the only record of possible interspecies aggression among baleen whales, but there have been an observation of social interaction behavior between the two species on Sakhalin.

Pacific groups

The two populations of Pacific gray whales (east and west) are morphologically

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