During their evolutions, on such occasions, the dense mass which they form exhibits a beautiful appearance,
as it changes its direction, now displaying a glistening sheet of azure,
when the backs of the birds come simultaneously into view, and anon suddenly presenting a mass of rich, deep purple.
They then pass lower, over the woods, and for a moment are lost among the foliage, but again emerge, and are seen gliding aloft.
They now alight; but the next moment, as if suddenly alarmed, they take to wing,
producing by the flappings of their wings a noise like the roar of distant thunder,
and sweep through the forests to see if danger is near. Hunger, however, soon brings them to the ground.
When alighted, they are seen industriously throwing up the withered leaves in quest of the fallen mast.
The rear ranks are continually rising, passing over the main body,
and alighting in front, in such rapid succession, that the whole flock seems still on wing.
The quantity of ground thus swept is astonishing;
and so completely has it been cleared that the gleaner who might follow in their rear would find his labor completely lost.
On such occasions, when the woods are filled with these pigeons,
they are killed in immense numbers, although no apparent diminution ensues.