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THE HOVERING OF THE KESTREL.
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requires so much strength of wing or such an exercise of force as when birds rise almost straight up. Snipes do it, and woodcocks; so also pheasants, rocketing with tremendous effort; so also a sparrow in a confined court, rising almost straight to the slates. Evidently this needs great power. Hovering is very interesting; but not nearly so mysterious as at least one other power possessed by birds.
