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grass -- but humans are not part of a bears diet.

they sing under sea ice during the Arctic winter when its dark all day.the authors suggest that delivering song diversity might serve an adaptive advantage in attracting mates.

though theres no evidence of this.These song lengths might strike us as odd.the bowheads were found singing 24 hours a day during the winter months.

Stafford and her research team published their results on April 4 in the journal Biology Letters.playlistItemCallback = function (item.

Credit: Kate Stafford/University of WashingtonBetween 2010 and 2014.

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remain mostly inaccessible to humans.since were used to three and a half minute pop songs.

an old stone spearhead -- a weapon that hadnt been used since the 1800s -- was found embedded in a bowhead whales blubber.Whales are heavily reliant upon sound to communicate in their murky.