In the part of Thrace which lies above Amphipolis, men[2924] and hawks go in pursuit of prey, in a sort of partnership as it were; for while the men drive the birds from out of the woods and the reed-beds, the hawks bring them down as they fly; and after they have taken the game, the fowlers share it with them. It has been said, that when sent aloft, they will pick[2925] out the birds that are wanted, and that when the opportune moment for taking them has come, they invite the fowler to seize the opportunity by their cries and their peculiar mode of flying. The sea-wolves, too, in the Palus Mæotis, do something of a very similar nature; but if they do not receive their fair share from the fishermen, they will tear their nets as they lie extended.[2926] Hawks will not[2927] eat the heart of a bird. The night-hawk is called cybindis;[2928] it is rarely found, even in the woods, and in the day-time its sight is not good; it wages war to the death with the eagle, and they are often to be found clasped in each other’s talons. CHAP. 11. (9.)—THE ONLY BIRD THAT IS KILLED BY THOSE OF ITS OWN KIND.—A BIRD THAT LAYS ONLY ONE EGG. The cuckoo seems to be but another form of the hawk,[2929] which at a certain season of the year changes its shape; it being the fact that during this period no other hawks are to be seen, except, perhaps, for a few days only; the cuckoo, too, itself is only seen for a short period in the summer, and does not make its appearance after. It is the only one among the hawks that has not hooked talons; neither is it like the rest of them in the head, or, indeed, in any other respect, except the colour only, while in the beak it bears a stronger resemblance to the pigeon. In addition to this, it is devoured by the hawk, if they chance at any time to meet; this being the only one among the whole race of birds that is preyed upon by those of its own kind. It changes its voice also with its appearance, comes out in the spring, and goes into retirement at the rising of the Dog-star. It always lays its eggs in the nest of another bird, and that of the ring-dove[2930] more especially,—mostly a single egg, a thing that is the case with no other bird; sometimes however, but very rarely, it is known to lay two. It is supposed, that the reason for its thus substituting its young ones, is the fact that it is aware[2931] how greatly it is hated by all the other birds; for even the very smallest of them will attack it. Hence it is, that it thinks its own race will stand no chance of being perpetuated unless it contrives to deceive them, and for this reason builds no nest of its own: and besides this, it is a very timid animal. In the meantime, the female bird, sitting on her nest, is rearing a supposititious and spurious progeny; while the young cuckoo, which is naturally craving and greedy, snatches away all the food from the other young ones, and by so doing grows plump and sleek, and quite gains the