Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favoured bats that make a go of the night-hunting trade.
考虑到夜晚也可以生存，并且可供选择的白天的“交易”完全被占用，它们自然选择偏爱那些成功在夜间进行捕食“交易”的蝙蝠。
The humans might have used the wolves' better hunting skills to help them hunt animals. The wolves could warn humans of danger at night.
人类可能也觉得有这些狼也不错，因为它们有很好的捕猎能力帮助他们捕获猎物，并且能在晚上危险来临时给他们警告。
Data collected on nearly 22, 000 of the birds' foraging dives showed that most were hunting prey at 50 to 100 meters below the surface, where the water is quite dark-akin to early night.
从22 000只鸟的身上采集到的数据发现，它们潜水捕食大多深入到水下50 - 100米，那里已经相当暗了，像上半夜一样。
应用推荐