The Common Dolphin (Delphinidaeis Delphinus) the most abundant cetacean in the world, with a global population of about six million. They are medium-sized dolphins, although the range between 80–150 kg is more common. Males are generally longer and heavier. The color pattern on the body is unusual. The back is dark and the belly is white, while on each side is an hourglass pattern colored light grey, yellow, or gold in front and dirty grey in back. They have long, thin rostra with up to 50–60 small, sharp, interlocking teeth on each side of each jaw.