The next point is, Where does he hover? He hovers any and everywhere, without the slightest choice. He hovers over meadows, cornfields; over the tops of the highest downs, sometimes at the very edge of a precipice or above a chalk quarry; over gardens, waste ground; over the highway; over summer and other ricks and thatched sheds, from which he sometimes takes his prey; over stables, where mice abound. He has no preference for one side of a hedge or grove, and cares not the least on which the wind blows. His hovering is entirely determined by his judgment as to the chance of prey. I have seen a kestrel hover over every variety of dry ground that is to be found. Next, as to the wind. If any one has read what has preceded upon his manner of preserving his balance, it must be at once apparent that, supposing a kestrel were hovering in a calm and a wind arose, he would at once face it, else his balance could not be kept. Even on the ground almost all birds face the wind by choice; but the hovering kestrel has no choice. He must hover facing the wind, or it would upset him: just as you may often see a rook flung half aback by a sudden gust. Hence has arisen the supposition that a kestrel cannot hover without a wind. The truth is, he can hover in a perfect calm, and no doubt could do so in a room if it were large enough. He requires no current of any kind, neither a horizontal breeze nor an ascending current. A kestrel can and does hover in the dead calm of summer days, when there is not the faintest breath of wind. He will and does hover in the still, soft atmosphere of early autumn, when the gossamer falls in showers, coming straight down as if it were raining silk. If you puff up a ball of thistledown it will languish on your breath and sink again to the sward. The reapers are sweltering in the wheat, the keeper suffocates in the wood, the carter walks in the shadow cast by his load of corn, the country-side stares all parched and cracked and gasps for a rainy breeze. The kestrel hovers just the same. Could he not do so, a long calm would half starve him, as that is his manner of preying. Having often spent hours in trees for the purpose of a better watch upon animals and birds, I can vouch for it that ascending currents are not frequent--rare, in fact, except in a gale. In a light air or calm there is no ascending current, or it is imperceptible and of no use to the kestrel. Such currents, when they do exist, are very local; but the kestrel's hover is not local: he can hover anywhere. He can do it in the face of a stiff gale, and in a perfect calm. The only weather he dislikes is heavy thunder, rain, or hail, during which he generally perches on a tree; but he can hover in all ordinary rain. He effects it by sheer power and dexterity of wing. Therefore if the fact has any bearing upon the problem of flight, the question of currents may be left out altogether. His facing the wind is, as has been pointed out,