Belugas, like other Arctic whales, do not have dorsal fins (a dorsal fin causes extra heat loss and would be a major hindrance in the arctic ice), but they do have a tough dorsal ridge. They also have... more 
Belugas, like other Arctic whales, do not have dorsal fins (a dorsal fin causes extra heat loss and would be a major hindrance in the arctic ice), but they do have a tough dorsal ridge. They also have a thick layer of blubber that insulates them from the icy arctic waters. © Kevin Schafer / WWF-Canon
To learn more visit worldwildlife.org/arctic less 
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| Photo By © Kevin Schafer / WWF-Canon / © Kevin Schafer / WWF-Canon
Sun, Apr 15, 2012 8:04 PM EDT