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I'm in San Diego and I regularly watch crows fight hawks in midair, which defiantly ignore them.

• sandworm101 8y ago
  Hawks dive on prey from altitude, at speeds higher than anything can achieve in level flight. They dive with their wings partially retracted. It's hard to see. The attack is over in a second or two. So if you see crows fighting back then the hawk is moving slowly, probably working its way back to altitude and unable to respond.