Patters on a Cave

I was somewhere like a party where I found a doorway that lead to a cave. As I walked further in I saw a little boy staring and some drawings on a cave. They boy whispered: " wow I just saw a crocodile" I looked at the drawings but didn't see it. I asked the boy if he stared at one particular spot and then looked from the corner of his eyes when he saw the crocodile and he said: "Yes of course"