The chicken probably thinks, in its limited way, that the line is a snake and the learned behavior is to lay still, hoping the snake would crawl away. A cat wou

The chicken probably thinks, in its limited way, that the line is a snake and the learned behavior is to lay still, hoping the snake would crawl away. A cat would probably jump, if the line is drawn with a bit higher quality. Another example is birds avoiding vertical stripes, because that's how cats and other predators typically look (two stripes on the forehead). How would you personally act if you found yourself in a dimly lit room with something like a big snake on the wall? You'd stand still for a minute, as movement would attract the snake, and only after a "timeout" you'd assume the snake is fake.