When you think of an animal that reacts to people, what comes to your mind? Is it a dog,a cat, or horse? You probably don't think of an octopus. To most people,the octopus seems like a stupid marine animal because of its strange appearance.But octopuses have very large brains,and they are intelligent.For example,an octopus is in an aquarium,and it sees food outside.What happens? It finds a way to reach the food with its long arms.Octopus are also very strong,and often they remove obstacles that separate them from their meal.