我们认为卷尾燕已经进化到警示斑点鹃自己的存在。通过帮助斑点鹃种群更有效率地捕食来寻找更多偷取食物的机会。
We think that drongos have evolved to alert babblers to their presence because helping the group forage more effectively leads to more frequent opportunities for theft.
通常，卷尾燕栖息在斑点鹃种群的巢穴上部，一次又一次地俯冲下来偷取食物。
Traditionally, the drongo perches above a crowd of foraging pied babblers and swoops in from time to time to steal its catch.
通常，卷尾燕栖息在斑点鹃种群的巢穴上部，一次又一次地俯冲下来偷取食物。
Traditionally, the drongo perches above a crowd of foraging pied babblers and swoops in from time to time to steal its catch.
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