White says, that “while the cows are feeding in the moist, low pastures, broods of Wagtails, white and grey, run round them, close up to their noses, and under their very bellies, availing themselves of the flies that settle on their legs, and probably finding worms and larvæ that are roused by the trampling of their feet. Nature is such an economist that the most incongruous animals can avail themselves of each other.”
“Interest makes strange friendships!”
THE SWALLOW. (Hirundo rustica.)
“From the low-roof’d cottage ridge
See the chattering Swallow spring;
Darting through the one-arch’d bridge,
Quick she dips her dappled wing.”
Cunningham.
Swallows are easily distinguished from all other birds, not only by their general structure, but by their twittering note and mode of flying, or rather darting from place to place.