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Crows are highly intelligent birds that can easily be tamed, yet they are regarded by Western cultures as harbingers of doom because of their dark plumage, unnerving calls, and the fact that they have been known to loiter around battlefields, feed on corpses, and destroy grain crops. They are smart enough to recognize individual humans and can hold grudges against specific people. Due to their sensitivity to it, crows are a good indicator of the spread of what virus that also attacks humans? Discuss
Source: The Free Dictionary