"The Night Falcons," says Audubon, "make their appearance in Louisiana about the first of April, during their migrations eastward, but never breed either in that State or in Mississippi. So rapid is their transit through these parts of the country, that the flocks have entirely disappeared within a few days of their arrival, whilst in the Southern States, on the contrary, they are often to be met with from the fifteenth of August till October. These wandering parties generally fly over the towns and villages, and settle from time to time upon the trees or houses, meanwhile uttering a harsh, shrill note, that cannot fail to attract the attention of all who hear it. We have seen them in Maine about June, and in the Central States somewhat earlier. These birds penetrate northwards as far as New Brunswick, but are rarely or never met with in Labrador or Newfoundland." The flight of the Night Falcons is light, animated, and capable of being long sustained, it is accompanied by loud, shrill cries, as the birds alternately soar above the summits of lofty mountains, or, rapidly sinking, continue their course close to the surface of the water. During such times as they are trying to attract the attention of the female part of the community, their evolutions become almost inconceivably fleet and agile; it is not uncommon to see one of them, after describing a series of the most elegant gyrations, come rushing down with such headlong velocity towards its intended partner, that it seems to render its death inevitable; but when within a few yards of the earth the bird dexterously spreads out its wings and tail, and again rises into the air, in order to recommence its sportive manœuvres. Audubon describes the spectacle of several males thus offering and exhibiting their admiration as being most amusing, and tells us that no sooner has the female made her choice, than the happy mate elect at once begins to harry and drive his rivals from the field.