Dolphins are mammals and a subspecies of the toothed whales. In some species of dolphins the teeth number more than 260.
But some dolphins, like the Yunus Dolphin which is native to Bushehr Province, south of Iran have 4-14 teeth mostly placed on the lower jaw.
Like other mammals, dolphins have lungs and come to the sea surface to breathe. Dolphins have only one blowhole (nostril); hence their skull is asymmetric.
The Yunus Dolphin is very gregarious. It can stay under water for 20 minutes. Dolphins often eat squids and octopuses.