Mice twitch their noses at potential mates, colorful peacocks strut around for admiring peahens, and pigeons puff their chests to look buff.

老鼠在遇到自己的潜在伴侣时会抽动鼻子，雄孔雀在遇到心仪的雌孔雀时会开屏，鸽子则会鼓起胸脯使自己看起来很健壮。