"Here, again, the tyrant of creation, man, interferes, disturbing the harmony of this peaceful scene. As the young birds grow up, their enemies, armed with axes, reach the spot, to seize and destroy all they can. The trees are felled and made to fall in such a way that the cutting of one causes the overthrow of another, or shakes the neighbouring trees so much that the young Pigeons or Squabs, as they are named, are violently hurled to the ground. In this manner also immense quantities are destroyed." Wilson thus describes the breeding-places in detail:--"When the Passenger Pigeons have frequented one of these places for some time, the appearance it exhibits is surprising. The ground is covered to the depth of several inches with their dung; all the tender grass and underwood destroyed; the surface strewed with large limbs of trees broken down by the weight of the birds clustering one above another; and the trees themselves, for thousands of acres, killed as completely as if girdled with an axe. The marks of this desolation remain for years on the spot, and numerous places could be pointed out where, for several years after, scarcely a single vegetable made its appearance. By the Indians such a breeding-place is considered an important source of national profit and supply during the season, and all their active ingenuity is exercised on the occasion. "Not far from Shelbyville, in the State of Kentucky, there was one of these breeding-places, which stretching through the woods in nearly a north and south direction, was several miles in breadth, and was said to be upwards of forty miles in extent. In this tract almost every tree was furnished with nests, wherever the branches could accommodate them. The Pigeons made their first appearance there about the tenth of April, and left it altogether with their young before the twenty-fifth of May. As soon as the young were fully grown, and before they left the nests, numerous parties of the inhabitants from all parts of the adjacent country came with wagons, axes, beds, and cooking utensils, many of them accompanied by the greater part of their families, and encamped for several days at this immense nursery. Several of them informed me that the noise in the woods was so great as to terrify their horses, and that it was difficult for one person to make another hear without bawling in his ear. The ground was strewed with broken limbs of trees, eggs, and young Squab Pigeons, which had been precipitated from above, and on which herds of hogs were fattening. Hawks, Buzzards, and Eagles were sailing about in great numbers, and seizing the Squabs from their nests at pleasure; while, from twenty feet upwards to the tops of the trees, the view through the woods presented a perpetual tumult of fluttering and crowding Pigeons, their wings roaring like thunder, mingled with the frequent crash of falling timber, for now the axe-men were at work, cutting down those trees that seemed to be most crowded with nests."