sex feathers

例句：

1. 1. The bird's sex feathers are a striking contrast to its duller back color.
   这只鸟的性别羽毛与它暗淡的背部颜色形成了鲜明的对比。
2. 2.The female bird has brightly colored sex feathers that attract mates.
   雌性鸟类拥有鲜艳的颜色，用于吸引配偶。
3. 3.The male bird displays his sexual feathers during courtship rituals.
   雄性鸟类在求偶仪式中展示其性羽毛。