Colour
All-white colour in adults, unique among cetaceans for regularly occurring white coloration.
Species Guide
What to know about beluga whales
A clean field guide focused on habitat, identification, behavior, and conservation context without burying the useful parts.
The beluga whale (Delphinapterus leucas) is an Arctic and sub-Arctic cetacean and one of two living members of the family Monodontidae, the other being the narwhal. It is the only member of the genus Delphinapterus. Belugas are characteristically all white and lack a dorsal fin, adaptations that facilitate swimming under ice. They have a large, deformable protuberance at the front of the head called the melon, used for echolocation; hearing and echolocation are highly developed and help locate breathing holes under sheet ice. Adult males can reach about 5.5 m (18 ft) in length and weigh up to 1,600 kg (3,530 lb). Belugas have a stocky body with a high proportion of blubber. They are gregarious, typically forming groups averaging around 10 animals, though in summer they may gather in the hundreds or thousands in estuaries and shallow coastal areas. They are relatively slow swimmers but can dive to depths of about 700 m (2,300 ft). Belugas are migratory in many populations, moving with seasonal ice changes to estuaries and coastal areas in summer, while some populations are more sedentary. They are opportunistic feeders, with diets that vary by location and season. The global population is thought to be around 200,000, though some subpopulations have declined considerably.
Belugas face threats from hunting, contamination (including PCBs), predation, climate change, and infectious diseases; some regional populations have declined substantially while others remain more stable.
Many beluga populations are migratory, wintering around the Arctic ice cap and moving to river estuaries and coastal areas in summer; some populations are sedentary and do not migrate long distances.
Identification
How to identify beluga whales
The visual markers divers can use underwater, plus the species most likely to cause confusion.
Key identification markers
Absence of dorsal fin
No dorsal fin, an adaptation that aids swimming under ice.
Melon
A large, deformable protuberance at the front of the head houses the echolocation organ.
Size and build
Stocky body; males can grow up to about 5.5 m (18 ft) and weigh up to 1,600 kg (3,530 lb).
Blubber
A large percentage of body weight is blubber (subcutaneous fat).
Common lookalikes
Melon-headed whale (name confusion)
The name 'melonhead' is sometimes applied to belugas but more commonly refers to the melon-headed whale, an oceanic dolphin.
Range and Movement
How beluga whales move through the world
The broad range, seasonal movement, or migratory behavior that shapes where divers encounter this species.
Many beluga populations are migratory, wintering around the Arctic ice cap and moving to river estuaries and coastal areas in summer; some populations are sedentary and do not migrate long distances.
Diet
What beluga whales tend to eat
Useful feeding context that often explains habitat, movement, and encounter style.
Opportunistic feeders; diet composition varies with location and season.
Population
Estimated numbers and what we actually know
Published estimates when credible, or an explicit note when no reliable global count exists.
Worldwide population is thought to be around 200,000, while some regional subpopulations have declined substantially (for example, Cook Inlet is critically endangered).
Conservation
What is happening with Beluga Whales
Status, pressure, and protection context grounded in cited sources rather than filler.
Belugas face threats from hunting, contamination (including PCBs), predation, climate change, and infectious diseases; some regional populations have declined substantially while others remain more stable.
Main threats
Hunting
Native and some non-native hunts occur; regulations differ by country and aboriginal whaling is excluded from the IWC moratorium.
Contamination
Pollutants such as polychlorinated biphenyls (PCBs) bioaccumulate in rivers and food chains, posing health risks.
Predation
Natural predators include polar bears and killer whales.
Climate change
Changes to sea ice and Arctic environments affect habitat and seasonal movements.
Infectious diseases
Diseases can impact populations alongside other stressors.
Protections and controls
United States Endangered Species Act
The Cook Inlet subpopulation in Alaska is protected under the U.S. Endangered Species Act.
International Whaling Commission moratorium exclusion
Aboriginal whaling is excluded from the IWC 1986 moratorium, allowing certain indigenous hunts for consumption and sale.
Responsible Encounters
How to dive with beluga whales
Conservation-minded guidance for divers who want the encounter without adding pressure.
Give beluga whale space, avoid blocking the animal's path, and follow local site and operator rules for wildlife interactions with whales.
Field Notes
Interesting things worth knowing
Useful species context that makes the encounter more meaningful once you are underwater.
Field notes
Sea canary
They are nicknamed the 'sea canary' for their high-pitched calls.
Social aggregations
While groups average about 10 individuals, belugas can gather in the hundreds or thousands in summer estuaries and shallow coastal areas.
Deep divers
They can dive to depths of approximately 700 m (2,300 ft).
Commonly kept in captivity
Belugas are among the most commonly kept cetaceans in aquariums and wildlife parks in North America, Europe and Asia.
FAQ
Frequently asked questions
Clear planning and conservation answers written for search visibility and AI retrieval.
Research Sources
Beluga Whale information sources
Primary and credible references behind the field-guide and conservation claims on this page.
Sources 4Last Updated
Beluga Whale | NOAA Fisheries · Reference · NOAA Fisheries
Primary wildlife guide source.
Alaska Department of Fish and Game · Reference · Alaska Department of Fish and Game
Supporting wildlife source.
WWF · Reference · WWF
Supporting wildlife source.
Beluga whale · Encyclopedia · Wikipedia
Supporting wildlife source.
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