Beluga whales, or white whales, are Arctic and subarctic marine mammals known for their white color and varied vocalizations, which have earned them the nickname "canaries of the sea.
They are highly social animals, grouping together to hunt and migrate. They are characterized by their bulging, flexible forehead, called a "melon," which allows them to change shape and is used for echolocation.
They feed on fish, shrimp, and crabs, and are able to navigate rivers to find food.
Habitat & Distribution
Beluga whales inhabit the cold Arctic and subarctic waters of the Northern Hemisphere, found in Alaska, Canada, Greenland, Russia, and northern Europe.
They are highly social animals, grouping together to hunt and migrate. They are characterized by their bulging, flexible forehead, called a "melon," which allows them to change shape and is used for echolocation.
They are distributed in distinct populations, some resident and others migratory, which use the diverse coastal and deep-water habitats of the Arctic for feeding and shelter.
Size
Adults average 3 m (9.8 ft) in length.
Males average between 3.4 and 4.6 m (11.2 and 15.1 ft) and weigh around 1,500 kg (3,307 lb).
Females average between 3 and 4 m (9.8 and 13.1 ft) and weigh around 1,360 kg (2,998 lb).
Beluga whales reach their full size at around 10 years of age.
Diving
Up to 25 minutes, although the average duration of a dive is usually shorter, between 9 and 18 minutes, reaching depths of up to 800 meters.
Diet
They have a varied diet of small cetaceans, which varies depending on the season and location.
Known species include marine fish, freshwater fish, mollusks, cephalopods (squid and octopus), and more.
Predators
Polar bears can become threats in winter because open waters become sealed off by ice.
Orcas are a threat as they kill both calves and adult belugas.
Adaptations
Wide range of vocalizations (anatomical and behavioral.
They do not have a dorsal fin, but rather an elongated dorsal cres.
They live in groups of varying size.
Low surface area-to-volume ratio.
Countercurrent heat exchanger in flippers and caudal fins.
Etc.
Life Cycle Behavior
While sleeping, brain waves are produced in only one of the brain's two hemispheres. This means that one hemisphere of the brain is always active during sleep, allowing them to control breathing patterns and surface.
The beluga's reproductive cycle is seasonal, although there is slight variability between different geographic regions. Most of the cycle occurs from April to May, although in some areas the breeding season can begin as early as February and not end until late June.
Belugas give birth to one calf at a time, and the birth of a beluga lasts eight hours on average.
Communication
Vocalizations, whistles, and one or two pulsed sounds, produced synchronously in the same vocalization.
Conservation Status
The IUCN classifies the beluga as critically endangered and vulnerable.
It is estimated that there are between 150,000 and 200,000 belugas in the wild, while there are more than 300 belugas in captivity worldwide.
Threats
Human activities such as noise, pollution, maritime traffic, and industrial activity cause disease, reduce habitat quality, and contaminate the food supply.
Human Interaction
While beluga whales certainly come across as friendly, interacting with them in the wild can harm both whales and humans.
