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A hovering kestrel is not truly stationary, but faces into the wind to give it lift and keep it in the air. Unlike barn owls who use hearing to hunt, kestrels hunt by sight alone and do not have to be silent themselves. If the wind speed drops, the kestrel has to flap its wings to keep the air moving over them. When it sees something on the ground, it makes a quick turn into the wind and then drops.