Details: This poster shows four dolphins swimming underwater.
Dolphins are aquatic mammals which are closely related to whales and porpoises. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture. A group of dolphins can be called a school or pod. Dolphins are often trained to perform in dolphin shows. There are military dolphins trained for wartime tasks such as locating sea mines.