Beluga Whale

What Is a Beluga Whale?

The beluga whale (Delphinapterus leucas) is a small, highly social toothed whale of Arctic and subarctic seas, instantly recognized by its pure white skin and rounded forehead. Together with the narwhal, it belongs to the family Monodontidae. Its playful vocal nature has earned it the nickname “sea canary.”

Appearance and Identification

Belugas are among the most distinctive of all whales. Adults are uniformly white, while calves are born dark gray and gradually lighten over several years. A bulbous forehead, called the melon, sits above a short, flexible beak, and unlike most whales the beluga can change the melon’s shape while producing sounds. It lacks a dorsal fin, replaced by a low ridge along the back, an adaptation that helps it move beneath sea ice. Unfused neck vertebrae give it an unusually flexible neck, allowing it to nod and turn its head. Adults typically measure 3.5 to 5.5 meters (11 to 18 feet) and weigh between about 500 and 1,600 kilograms, with males larger than females.

Habitat and Range

Belugas live throughout the cold coastal waters of the Arctic and subarctic, including the seas around Alaska, Canada, Greenland, Norway, and Russia. They favor shallow bays, river mouths, and estuaries, especially in summer when many populations gather in warmer, sediment-rich river outflows. In winter they move with the shifting pack ice, using cracks and openings in the ice to breathe. Some populations migrate long distances seasonally, while others, such as the group in the St. Lawrence estuary, remain relatively resident year-round.

Diet

The beluga is a carnivore with a varied, opportunistic diet. It feeds on fish such as cod, salmon, herring, and capelin, along with squid, octopus, shrimp, crabs, and marine worms. Rather than chewing, belugas seize prey and swallow it whole, and they can even suck prey up from the seafloor. Foraging often takes them into deep water, where they can dive several hundred meters, though much feeding occurs in shallow coastal zones.

Behavior

Belugas are exceptionally social and usually travel in pods of several to dozens of individuals, occasionally massing in the hundreds or thousands at favored gathering sites. They are famously vocal, producing an elaborate range of clicks, whistles, chirps, and squeals used for communication and echolocation. Echolocation is essential for navigating dark, ice-covered waters and detecting prey. Curious and playful, belugas often interact with objects and one another, and their flexible facial features let them appear to make a variety of expressions.

Life Cycle and Reproduction

Females generally become mature at around four to seven years and males somewhat later. After a gestation of roughly 14 to 15 months, a single calf is born, usually in warm summer estuaries. Newborns are dark gray and depend on their mother’s milk for up to two years, staying close during a long period of learning. Females typically give birth once every two to three years. This slow reproductive rate makes beluga populations sensitive to added pressures. In the wild, belugas commonly live 35 to 60 years.

Conservation Status

Globally the beluga whale is listed as Least Concern by the IUCN, reflecting a large overall population. However, several regional groups are far more vulnerable; the Cook Inlet population in Alaska and the St. Lawrence estuary population, for example, are considered endangered and have struggled to recover. Threats include pollution and industrial contaminants, underwater noise, habitat disturbance, reduced prey, entanglement, and the long-term effects of climate change on sea ice. Some Arctic communities also hunt belugas under regulated subsistence programs.

Frequently Asked Questions

Why are beluga whales white? Adults develop white skin as they mature, which likely provides camouflage among ice and snow; calves are born dark gray and lighten with age.

Are belugas whales or dolphins? Belugas are toothed whales in the family Monodontidae, closely related to the narwhal, though they share many traits with dolphins.

How do belugas survive under sea ice? They lack a dorsal fin, allowing them to swim beneath ice, and they use echolocation and breathing holes in the ice to navigate and surface for air.