Fielding, Tom Jones
(4) 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. The kestrel, or windhover, has a peculiar mode of hanging in the air in one place, his wings all the while being briskly agitated. Hen-harriers fly low over heaths 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 centre of gravity. Rooks sometimes dive and tumble in a frolicsome manner; crows and daws swagger in their walk; wood-peckers fly volatu undoso, opening and closing their wings at every stroke, and so are always rising or falling in curves.
White, The Natural History of Selborne
5. The following are three examples of the heroic couplet, arranged in chronological order. Examine the meter, vocabulary, and subject of each, and state if any development is noticeable.
(1) Enlarge my life with multitude of days!
In health, in sickness, thus the suppliant prays;
Hides from himself his state, and shuns to know,
That life protracted is protracted woe.
Time hovers o’er, impatient to destroy,
And shuts up all the passages of joy: