...Like the othermedium-sized whale in the same region, the beluga or whitewhale, the narwhal has no dorsal fin... 
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...It has been noted that they are found in isolated pocketswithin that range and are not, like the beluga, widelydistributed...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...Furthermore, the body of the beluga ismore robust...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
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