Beluga Profile

6. Beluga Whale Profile

Common Name: Beluga Whale
Scientific Name: Delphinapterus leucas 

Genus: Delphinapterus 

Family: Monodontidae 

Order: Artiodactyla 

Class: Mammalia 

Phylum: Chordata 

Conservation Status: Least Concern (IUCN) — some populations Critically Endangered

Physical Description

The Beluga Whale is one of the most recognizable cetaceans in the world, distinguished by its striking all-white coloration and rounded, bulbous forehead known as a melon. Unlike most other whales and dolphins, the beluga has no dorsal fin — an adaptation that allows it to swim freely beneath sea ice. Its neck vertebrae are not fused, giving it a rare and remarkable ability to turn its head in multiple directions.

Length: 3.5–5.5 m 

Weight: 700–1,600 kg (males are significantly larger than females)

Belugas are born dark grey or brown and gradually lighten to their characteristic white over the first five to ten years of life. Their melon is highly flexible and changes shape during vocalization, playing a key role in echolocation and communication.

Habitat

Belugas are Arctic and sub-Arctic specialists, though some populations migrate into warmer waters seasonally.

Primary Habitat: Arctic and sub-Arctic coastal waters, estuaries, and river mouths 

Geographical Range: Canada, Russia, Alaska (USA), Greenland, and Norway

They are highly adaptable and are one of the few cetaceans that regularly enter freshwater rivers. In summer, many populations gather in warm, shallow estuaries to moult and give birth. In winter, they follow the retreating ice edge or remain in partially frozen seas, using their unfused neck and robust bodies to navigate through sea ice.

Diet

Belugas are opportunistic carnivores with a broad and flexible diet.

Primary Food: Fish (salmon, cod, herring, and capelin), squid, and octopus 

Additional Food: Crustaceans, sandworms, and other bottom-dwelling invertebrates

Belugas use echolocation — emitting a series of clicks and listening for returning sound waves — to locate prey in dark or murky water. They are capable of diving to depths of over 700 m in pursuit of food, though most feeding takes place at shallower depths.

Behavior & Social Structure

Belugas are among the most vocal and socially complex of all cetaceans, earning the nickname "the canary of the sea."

Activity: Active throughout the day and night 

Group Size: Typically 10 to hundreds of individuals; seasonal aggregations can reach thousands 

Communication: An extraordinarily rich repertoire of clicks, whistles, chirps, squeals, and clangs used for echolocation, social bonding, and navigation.

Belugas are highly gregarious and form tight-knit pods often based on sex and age. They are known to engage in play behavior, cooperative foraging, and prolonged care of young. Their flexible melon and mobile facial muscles give them an expressive appearance, and they are capable of producing sounds audible above the water's surface.

Reproduction

Belugas have a slow reproductive rate, which makes population recovery from decline particularly challenging.

Gestation Period: Approximately 14–15 months 

Litter Size: 1 calf 

Weaning Age: Around 2 years, though calves may remain with their mothers for several years beyond that

Females typically give birth every 2–3 years. Calves are born dark grey and are immediately mobile, swimming alongside their mothers. Beluga mothers are highly attentive and calves benefit from extended maternal care, during which they learn migration routes, foraging techniques, and social behaviors from experienced group members.

Conservation Status

The global Beluga Whale population is currently classified as Least Concern by the IUCN, with an estimated 150,000–200,000 individuals worldwide. However, this broad classification masks serious regional variation — several distinct populations are in steep decline and are listed separately as Critically Endangered.

Population Trend: Stable globally, but declining in several key regional populations 

At-Risk Populations: Cook Inlet (Alaska), St. Lawrence Estuary (Canada), and certain Russian Arctic populations 

Conservation Efforts: Habitat protection, commercial hunting bans, pollution monitoring, shipping noise reduction, and marine protected areas

Climate change poses an accelerating threat, as shrinking sea ice alters prey availability and opens previously protected habitats to increased industrial activity and shipping traffic.

Did You Know?

The Canary of the Sea: Belugas produce an astonishing variety of sounds — clicks, whistles, squeals, and moos — many of which are audible above the waterline, earning them their famous nickname. 

Head Turner: Belugas are one of the only cetaceans capable of turning their heads side to side, thanks to unfused neck vertebrae — a trait that sets them apart from virtually all other whales and dolphins. 

Moulting Whales: Each summer, belugas migrate to warm, shallow estuaries partly to rub against gravel and shed their outer layer of skin in a process called moulting. 

Deep Divers: Belugas can dive to depths exceeding 700 m and hold their breath for up to 25 minutes.

Role in the Ecosystem

Belugas occupy a mid-level position in Arctic food webs, serving as both predator and prey. They help regulate populations of fish and invertebrates through predation, and are themselves an important food source for orca and polar bears. 

Their seasonal migrations connect marine and freshwater ecosystems, and their feeding activity stirs up sediments on the ocean floor, cycling nutrients that support broader marine productivity.  As indicators of Arctic ecosystem health, changes in beluga population and behavior serve as an early warning system for broader environmental shifts.

Why They're At Risk

Least Concern (IUCN)

Despite a stable global population, belugas face a growing range of threats. Climate change is the most pervasive, as the rapid loss of Arctic sea ice disrupts migration routes, reduces prey availability, and exposes belugas to new predators and human activity in previously inaccessible areas. Industrial noise from shipping, sonar, and resource extraction interferes with their echolocation and communication, making foraging and social bonding more difficult. 

Pollution — particularly heavy metals, PCBs, and other persistent contaminants — accumulates in beluga tissues and compromises immune function and reproduction. Some populations also face pressure from legal subsistence hunting. 

Regional populations in the Cook Inlet and St. Lawrence Estuary remain in critical condition despite decades of targeted protection, underscoring the need for sustained, locally focused conservation action.