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题目材料：
In North America, crows have historically antagonized humans by ravaging corn crops, but advancing urbanization has recently made humans more tolerant of crows, and crows' wariness has accordingly diminished. The future demeanor of the American crow (Corvus brachyrhynchos) is suggested by intercontinental analogy to India's house crow (Corvus splendens), which has lived for many centuries in an essentially unarmed, animal-friendly, and densely populated culture. Its audacity extends to stealing food from street vendors and entering dwellings to remove food from the table. The extreme watchfulness of the American crow has grown out of a long history of persecution. As people treat crows with insouciance rather than aggression, less wariness results in reproductive success, and another kind of corvine conduct asserts itself.
以上解析由 考满分老师提供。
