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来源：雅诚德英语网
Given that predators can make it costly to beg for food, what benefit do begging nestlings derive from their communications?
既然捕食者可以让雏鸟为食物付出巨大代价，那么乞食的雏鸟们到底可以从这种交流方式中得到什么益处呢？
Given that predators can make it costly to beg for food, what benefit do begging nestlings derive from their communications?
既然捕食者可以让雏鸟为食物付出巨大代价，那么乞食的雏鸟们到底可以从这种交流方式中得到什么益处呢？