Johnny Chuck in "The School in The Old Orchard"

Then each little Chuck would sit up very straight and not move the teeniest, weeniest bit, so that from a little distance they looked for all the world like tiny stumps. But all the time their sharp little eyes would be looking this way and that way, to see what the danger might be. After a while Johnny would give another little whistle, which meant "Danger past." Then they would once more begin to fill their little stomachs with sweet, tender, young clover.