A good ornithologist should be able to distinguish birds by their air as well as by their colors and shape, on the wing as well as on the ground; and in the bush as well as in the hand. For though it must not be said that every species of bird has a manner peculiar to itself, yet there is somewhat in most genera, at least, that at first sight discriminates them, and enables a judicious observer to pronounce upon them with some certainty.

Thus kites and buzzards sail round in circles with wings expanded and motionless; and it is from their gliding manner that the former are still called in the north of England gleads, from the Saxon verb glidan, to glide. Hen harriers fly low over the meadows or fields of corn, and beat the ground regularly like a pointer or setting dog. Owls move in a buoyant manner, as if lighter than the air; they seem to want ballast.

There is a peculiarity belonging to ravens that must draw the attention even of the most incurious—they spend all their leisure time in striking and cuffing each other on the wing in a kind of playful skirmish; and, when they move from one place to another, frequently turn on their backs with a loud croak, and seem to be falling to the ground. When this odd gesture betides them, they are scratching themselves with one foot, and thus lose the center of gravity. Rooks sometimes dive and tumble in a frolicsome manner; crows and daws swagger in their walk; woodpeckers fly with a wavy motion, opening and closing their wings at every stroke, and so are always rising or falling in curves. All of this genus use their tails, which incline downward, as a support while they run up trees. Parrots, like all other hooked-clawed birds, walk awkwardly, and make use of their bill as a third foot, climbing and descending with ridiculous caution.

All the gallinÆ parade and walk gracefully, and run nimbly, but fly with difficulty, with an impetuous whirring, and in a straight line. Magpies and jays flutter with powerless wings, and make no dispatch; herons seem encumbered with too much sail for their light bodies, but these vast hollow wings are necessary in carrying burdens, such as large fishes, and the like; pigeons, and particularly the sort called smiters, have a way of clashing their wings, the one against the other, over their backs with a loud snap; another variety, called tumblers, turn themselves over in the air.

The kingfisher darts along like an arrow; fern owls, or goatsuckers, glance in the dusk over the tops of trees like a meteor; swallows sweep over the surface of the ground and water, and distinguish themselves by rapid turns and quick evolutions; swifts dash round in circles; and the bank martin moves with frequent vacillations like a butterfly.

Most small birds hop; but wagtails and larks walk, moving their legs alternately. All the duck kind waddle; divers and auks walk as if fettered, and stand erect, on their tails. Geese and cranes, and most wild fowls, move in figured flights, often changing their position.