Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

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