Food and diving
The belugaĺs main food is octopus, krill and various species of fish such as salmon. They may sometimes pursue fish up large rivers. Belugas dive for 1-2 minutes at a time, down to a depth of 300 m.
Mating takes place when the ice thaws. Pregnancy takes about 14 months, and the resulting calf is 1.5 m long and 80 kg in weight. Belugas are grey or brown at birth but they lighten with age and when fully grown they are pale yellow or pure white.