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Northern Right Whale Dolphin


Scientific Name:
Lissodelphis borealis
Length:
2.0 - 3.0 m (6.6 - 9.8 ft)
Weight:
60 - 115 kg (130 - 250 lbs)
Status:
data deficient
Prey:
Surface and mid-water fish (including lanternfish, hake, sauries), squid and octopus

Physical characteristics

Has a streamlined body with a short beak and a sloping forehead.

Behavioral characterization

N/A

Distribution

Deep, cold temperate waters of the North Pacific Ocean, Mexico to Russia

Population size

68,000

Predators

N/A

Migration/Dispersal patterns

Migrate south and inshore in winter months, north and offshore in summer months. That coincides with the occurence of squid.

Social system/Group size

The average group sizes are 100 in the eastern Pacific and 200 in the western Pacific; they commonly mix with other marine mammals (Pacific white-sided dolphins, Risso's dolphins, pilot whales).

Major threats

They are hunted in Japan for meat and oil. Entanglement in fishing gear is another threat.

Research efforts

N/A

Fun fact

They are the only species of dolphin in the North Pacific Ocean without a dorsal fin.