Common Dolphins can be divided into two species: Short-beaked Common Dolphin or Long-beaked Common Dolphin. The specific name of short-beaked Common Dolphin is Delphinus delphis, while the long-beaked Common Dolphin is Delphinus Capensis. Common Dolphins travel in groups of around 10-50 and are frequently gather in schools that are about 100-2000 individuals. Besides that, Common Dolphins face a mixture of treats due to the human influence such as water pollution. Common Dolphins are also not common in captivity. They live in pacific oceans and can be found at northern Japan, California, and Australia.