Dolphins are an amazing animal. They are cetacean mammals closely related to whales and porpoises. They are Highly intelligent and use echolocation to locate food and other needs. They have acute eye sight both in and out of water and they can hear frequencies ten times or more above the upper limit of adult human hearing. These creatures are very social, usually living in pods--group of dolphins--of up to 20. Dolphins are always very helpful to each other and reports to other species as well. Stories of dolphins helping stranded whales to deeper water and swimming circles around humans to protect them from sharks have been reported.