Just Meat — Jack London

He strolled to the corner and glanced up and down the intersecting street, but saw nothing save the oases of light shed by the street lamps at the successive crossings. Then he strolled back the way he had come. He was a shadow of a man, sliding noiselessly and without undue movement through the semi-darkness. Also he was very alert, like a wild animal in the jungle, keenly perceptive and receptive. The movement of another in the darkness about him would need to have been more shadowy than he to have escaped him.