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Wikipedia: Beluga
Beluga are highly sociable creatures. They move in pods which commonly contain animals of the same gender and age. Groups of males may number in the hundreds.
Belugas are slow-swimming mammals which feed mainly on fish. They also eat cephalopods (squid, octopus) and crustaceans (crab, shrimp). Foraging on the seabed typically takes place at depths of up to 1,000 feet, but they can dive at least twice this depth.
Beluga exhibit a wide range of vocalisations including clicks, squeaks, whistles, squarks and a bell-like clang. One noted researcher in the field likens a noisy Beluga pod to the string section of an orchestra tuning up before a concert. Researchers have recorded 50 distinct sounds; most in the range of 0.1 to 12 kHz.
Their main natural predators are polar bears, especially when the whales become encircled and trapped by ice. The Bears club the trapped whale with a paw and then drag it on ice for a feast. Beluga are easily small enough to also be a target for an orca.
-Wikipedia
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