Dolphins come in various colors from gray to pink depending on the species. They live all around the world in oceans and seas. Dolphins eat a variety of foods including fish like mackerel and cod as well as squid. Larger dolphins may also eat other marine animals. Dolphins give birth every 2-3 years after a 12 month gestation period and typically care for one calf at a time. There are 41 known dolphin species with the bottlenose dolphin being the most common.