In flight

Owls move in a buoyant manner, as if 
lighter than air, herons seem incumbered 
with too much sail for their light bodies. 

The green-finch exhibits such languishing 
and faltering gestures as to appear 
like a wounded and dying bird.

Fernowls, or goat-suckers, glance in the dusk
over the tops of trees like a meteor; 
starlings as it were swim along. White-throats 

use odd jerks and gesticulations 
over the tops of hedges and bushes,
woodpeckers fly volatu undosu

opening and closing their wings at 
every stroke, and so are always rising 
or falling in curves.

(English naturalist Gilbert White, 1778)