The Cow Dolphin. Common from the Bahamas to the Florida Keys, the cow dolphin feeds on algae and seaweed. The cow dolphin produces a moo-ing sound that many scuba divers have compared to the siren sounds produced by the mythical muses. Traveling in herds, the female features small downward pointed horns and utters for feeding its young. The more aggressive male Bull Dolphin (pictured below her) features larger and upward pointed horns and has been known to charge boats with a red painted hull.