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动物界恩爱伴侣:单身汪你还不赶快脱单?
2016-08-09 14:09
来源:Little Things
作者:沪江
5. Swans
天鹅
Monogamy is surprisingly common for birds, but swans are one of the most famous examples.
一夫一妻制对鸟类来说十分普遍,但最出名的要数天鹅了。
In fact, one of their courtship rituals involves twining their necks together to form a perfect heart!
事实上,他们有很多求偶仪式,其中一个就是弯曲他们的脖子形成一个完美的心形!