How a Large Brown Snake Reacts to Movement! This is a great example of how snakes eyesight and reations are very movement orientated. This video is from a few years ago but its a great example of an Eastern Brown snake remaining calm even though he is being held onto and then as soon as there is movement or a possible threat they go into defence mode. He even decided to bite the bag a few times. If you see a snake in the wild please feel free to observe them from a safe distance. If you accident