balaenoptera borealis(n = noun.animal) sei whale - similar to but smaller than the finback whale;
is a kind of razorback, rorqual
is a member of balaenoptera, genus balaenoptera

aurora borealis, balaenoptera, balaenoptera acutorostrata, balaenoptera musculus, balaenoptera physalus, cancer borealis, clintonia borealis, corona borealis, genus balaenoptera, hygrophorus borealis, lanius borealis, lasiurus borealis, linn'91a borealis, linnaea borealis, linnaea borealis americana, numenius borealis, quercus borealis, synaptomys borealis