A male and female tree swallows (Tachycineta bicolor) are seen in flight, one positioned upside down and seemingly feeding the other, whose belly is turned toward the viewer. This bird is listed as white-bellied swallow (Hirundo bicolor, Vieill.) by the author, who describes it as follows:
Its flight is easy, continued, and capable of being greatly protracted. It is seen sailing, circling, turning, and winding in all directions, during the greater part of the day. Like all other Swallows, it feeds on the wing, unceasingly pursuing insects of various kinds, and in seizing them producing a snapping noise, which may be heard at some distance.