我们在研究中发现，在繁殖方面，严寒会削弱雄性的交配表现。
In studies, we found that when it comes to reproduction, freezing diminishes the mating performance of males.
当把雌性牛鹂单独养在隔音的房间里，让它们听到雄性的歌声，它们就会表现出交配行为。
When female cowbirds raised in isolation in sound-proof chambers were exposed to recordings of male song, they responded by exhibiting mating behavior.
原来是雌性背着雄性的尸体在空中盘旋。
The female was spiraling in the air with the corpse of the male butterfly attached.
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