Grace and athletic ism are optional for males in human courtship but both are mandatory in manakin courting.

人类在追求异性时健壮和优雅也可以加分；但在侏儒鸟群里这两者可都是必须的手段。

youdao

Grace and athletic ism are optional for males in human courtship but both are mandatory in manakin courting.

人类在追求异性时健壮和优雅也可以加分；但在侏儒鸟群里这两者可都是必须的手段。

youdao