North Pacific Right Whale

## Description

The North Pacific right whale is one of the giant whales and its head takes up about one-third of its body length and seems almost disproportionately large. Its seven-neck vertebrae fuse into a single mass, and it has hardened layers of skin on its head, lips, and chin, usually covered in whale lice and called callosities. Its body is broad and robust, and it has large, wide pectoral flippers. The upper jaw is the shape of an arch, from which hang its large, slender baleen plates. Its color is usually black; often it has a mottled appearance or white ventral patches.

## Distribution

This whale occurs throughout the North Pacific Ocean, from Russia and Japan in the west to North America's west coast and Alaska in the east. The population of the western North Pacific spends summer in the Okhotsk Sea and is occasionally sighted off Japan's east coast. The Northeast Pacific subpopulation summers in the southeastern Bering Sea and the Gulf of Alaska. North Pacific right whales migrate from summer to winter grounds. They mainly inhabit coastal or shelf waters, however, movement over deep waters has been observed.

## Behavior

North Pacific whales can generally be found traveling on their own or in pods of just 2-3 whales. Larger groups may travel together during the mating season. It is thought that right whales remain in the same region for days or sometimes weeks. They are usually regarded as non-aggressive, and what can be described as tender, towards others of their species, including competing males, potential mates, and young. Although slow, they are surprisingly acrobatic and are known for breaching, as well as slapping their flippers against the water's surface when they roll over. These right whales are curious, playful animals, and often bump and poke objects they come across in the water. They sometimes raise their tail flukes above the water as sails, a form of play.

## Diet

North Pacific right whales are carnivores (planktivores). Their diet consists of tiny planktonic copepods, the larvae of barnacles and crustaceans, and krill.

## Reproduction

These whales are polyandrous, with females likely to mate with many males, while males do not aggressively compete for females. Mating behavior in right whales includes tail and fin slapping at the surface, breaching, and "headstanding". Breeding generally occurs in winter, and, after a gestation period of 12-13 months, females give birth to a single calf. Mothers protect, nurse, and care for their offspring, putting significant amounts of energy into each one. A calf remains close to its mother and suckles for about a year. The female typically uses the third year to replenish her energy stores before mating again, so there are intervals between of three to five years. These whales become reproductively mature from about 8 to 11 years old, at which time they may bear their own calves.

## Population

### Threats

It is not possible to assess every threat to this species, due to their scattered distribution and rare occurrence, but they could include entanglement in fishing equipment and collisions with passing ships. Environmental changes and pollution may also be threats.

### Number

According to the IUCN Red List, the total number of the North Pacific right whale is around 500 individuals, including approximately 400 whales in the Okhotsk Sea and around 100 whales in the rest of the North Pacific. Currently, this species is classified as Endangered (EN) on the IUCN Red List.

## Fun Facts

These whales communicate with low-pitched whining and moaning sounds, which are able to be heard a long way away. They may also communicate by means of physical contact such as touching one another’s flippers and bumping into each other.

These whales are the rarest amongst all the species of large whales, and the rarest of marine mammals.

Instead of teeth, right whales have 8-inch long baleen plates. These comb-like structures separate the food from ingested water, acting as a sieve.

Right whales can stay under the water for 20 minutes. They tend to make 5 to 6 shallow dives before a longer diving session.

North Pacific right whales may swim towards boats and allow boats to approach them, as they are very friendly.