peck at

“ General Kynot pretended to peck at his chest for vermin.”

Son of a Witch

“The birds had come into the old elephant trail to dust, walking neatly and plumply, and when the pebble broke the back of one and the bird began to jerk and toss with its wings thumping, another bird ran forward to peck at it and David pouched another pebble and pulled it back and sent it against the ribs of the second bird.”

Simon & Schuster: Hemingway on Hunting

“In like manner the wonderful power which a chicken possesses only a few hours after being hatched, of picking up small particles of food, seems to be started into action through the sense of hearing; for with chickens hatched by artificial heat, a good observer found that "making a noise with the finger-nail against a board, in imitation of the hen-mother, first taught them to peck at their meat.”

The expression of the emotions in man and animals