“Belugas are the only whales that are white as healthy adults.”
Beluga whales are white Arctic cetaceans with flexible necks, expressive melons, and complex social pods that live among polar seas and summer estuaries.
By An Nguyen · Published · Updated
Delphinapterus leucasArtiodactylaMonodontidae
Browse beluga whale images—from white adults and gray calves to polar seas and summer estuaries.
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Core article
A closer look at habitat, diet, behavior, reproduction, and conservation.
The beluga whale (Delphinapterus leucas) is the white whale of the Arctic — a stocky, pale cetacean with a rounded forehead and, unusually for a whale, a neck flexible enough to turn its head. Its voice earned it the old sailors' name "canary of the sea," and its life is tied not to the open ocean but to polar seas, the shifting ice edge, and shallow coastal estuaries where whole populations gather each summer. Its only close relative is the narwhal; together they make up the family Monodontidae.
Belugas are among the most vocal whales, producing clicks, whistles, chirps, trills, and pulsed calls — the varied, high, birdlike sounds behind the "canary" nickname. This matters because belugas live where seeing is hard: under sea ice and in muddy river mouths, visibility is poor, so they rely on sound both to stay in contact with the pod and to echolocate prey. A large, soft forehead structure called the melon changes shape as the whale focuses its echolocation beam, in effect letting it "aim" its sonar.
Adult belugas are 11 to 18 feet long and 1,200 to 3,500 pounds, with males larger than females. Two features stand out. Unlike most whales, belugas have unfused neck vertebrae, so they can turn and nod their heads to scan the seafloor and follow prey — a real advantage in cluttered, shallow water. And they have no dorsal fin; in its place a tough dorsal ridge lets them slip beneath pack ice without a fin snagging, while also reducing heat loss. A thick blubber layer, often more than four inches deep, insulates against near-freezing water. Adults are pure white, but calves are born gray, brown, or bluish and only whiten over five to eight years.
Belugas are circumpolar, living in Arctic and sub-Arctic waters off Alaska, northern Canada, Greenland, Svalbard, and Russia. Their year is governed by ice: in winter many stay near open leads and polynyas, and in summer they crowd into warm, shallow river mouths such as the Churchill River on Hudson Bay or Alaska's Cook Inlet. This preference for nearshore shelves and estuaries — rather than deep ocean — brings them close to communities, shipping lanes, and development, and concentrates them into summer gatherings that researchers can count from the air. Isolated stocks like Cook Inlet's occupy tiny ranges and are far more fragile than the species overall.
Belugas are opportunistic carnivores whose diet shifts by region and season but reliably includes Arctic fish such as cod, capelin, and salmon, plus shrimp, crabs, clams, and squid. In shallow estuaries they may dive only briefly, using their flexible neck to probe the bottom and echolocation to pick prey out of mud and rock. Dense pods often follow seasonal runs of fish into rivers. Their own predators are orcas in open water and polar bears that ambush them near ice, and people have long hunted them for meat, oil, and muktuk.
Beluga society is social and strongly maternal. Pods range from a few animals to summer gatherings of hundreds or thousands, with females and calves at the core and males sometimes travelling apart. Constant acoustic contact holds groups together where sight fails. Belugas are also notably playful and curious — they blow bubble rings, mouth objects, rub against one another, and investigate boats and ice edges. That curiosity makes them popular in aquariums but also leaves them exposed to disturbance in busy coastal waters.
Gestation lasts about 14 to 15 months, and a single calf is usually born in spring or early summer in relatively warm, shallow water. The gray-brown newborn rides in its mother's slipstream, surfaces often to breathe, and nurses on fat-rich milk for up to two years. Belugas mature at roughly 5 to 10 years, and mature females calve every two to three years. Wild belugas commonly live from their mid-thirties to about fifty years — long enough to carry learned knowledge of migration routes, estuary timing, and ice navigation across generations.
Globally the beluga is listed as Least Concern, because several large Arctic stocks remain numerous — but that headline hides sharp local differences. Some populations are stable or growing, while others, most severely Cook Inlet, are critically endangered from a mix of noise, habitat loss, past overhunting, and low genetic diversity.
The main modern threats are underwater noise from ships and industry that masks echolocation, contaminants that build up in blubber, climate-driven changes in ice and prey timing, and entanglement or disturbance in coastal corridors. Because belugas depend on specific estuaries and ice edges, protecting them means managing each stock's habitat rather than relying on the reassuring global total.
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Artiodactyla
Family
Monodontidae
Genus
Delphinapterus
Species
D. leucas
Belugas are the only whales that are white as healthy adults.
They can turn their heads sideways because their neck vertebrae are not fused.
People call them canaries of the sea for their rich mix of clicks and whistles.
Calves are born gray or brown and slowly fade to white over several years.
Belugas often gather by the thousands in shallow Arctic rivers each summer.
They lack a dorsal fin, which helps them swim under sea ice.
Select a question to reveal the answer.
A beluga is a medium-sized toothed whale from the Arctic and sub-Arctic. Adults are white, lack a dorsal fin, and live in social groups called pods.
Belugas live in cold polar seas around Alaska, Canada, Greenland, Norway, and Russia. In summer many stocks move into warm river mouths and shallow bays.
They are carnivores that eat Arctic fish such as cod and salmon, plus shrimp, crabs, squid, and other seabed prey.
Adult white skin helps camouflage them among sea ice and light surface waters. Newborns start darker and lighten as they grow.
Globally the species is listed as Least Concern, but some local stocks—especially Cook Inlet belugas—are critically depleted and heavily protected.
They use echolocation: clicking sounds focused by the melon bounce back as echoes that map fish, ice edges, and seafloor shapes in dark water.
A baby beluga is called a calf. Calves nurse for about two years and stay close to their mothers while learning migration routes.
Yes. Belugas and narwhals are the only living members of the family Monodontidae, a small group of Arctic toothed whales.
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