mammal genus - a genus of mammals

Balaenopteridae, family Balaenopteridae - rorquals; blue whales

Balaenoptera musculus, blue whale, sulfur bottom - largest mammal ever known; bluish-gray migratory whalebone whale mostly of southern hemisphere

Balaenoptera physalus, common rorqual, fin whale, finback, finback whale - large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific

Balaenoptera borealis, sei whale - similar to but smaller than the finback whale

Balaenoptera acutorostrata, lesser rorqual, minke whale, piked whale - small finback of coastal waters of Atlantic and Pacific