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.Octopuses are generally shy creatures,but they sometimes show emotions.For example,they respond in a very human way when they come in contact with people. They actually seem friendly.They like to play.They come to get food,and they watch what happens around them.When they are afraid,they swim away.When people make them angry,they squirt water on them.In the wild,octopuses show emotion by changing color.When the octopus is attacking its prey,it becomes darker.When it is sick,it becomes light and pale.And when it doesn't get the food it wants,it turns red.It seems mad!