相关hummingbirds的文学知识

Whydohummingbirdsandgorillasbothhavebackbones?EitheroftwoSouthAmericanhummingbirds(Topazapyraora)havingcolorfulplumage.Butthoughtseludedher,dartinginandoutofhermindlikefrightenedhummingbirds.Mostbirds...

问题详情：      Hummingbirds(蜂鸟)areoneofnature’smostenergeticfliersandtheonlybirdstohover(盘旋)intheairbyrelyingontheirstrengthalone.      Nowscientistshavefoundthatitistheratio(比值)ofth...