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In the Canadian Arctic beluga whales gather in the few weeks when the ice leaves the shores. At this time, they assemble in vast numbers, sometimes up to a thousand at once. No one knows exactly why they come to this particular area. It may be because there is a particular food that they find in these shallow waters since they sometimes seem to deliberately stir up the gravelly bottom of the bay. Many who come are females with babies that are only a few months old swimming swiftly in their mothers' slipstreams. Belugas are nicknamed sea canaries because of the sounds they make. A young one twirls round and round in play.