The longest life span of dolphins can reach about 40 years, but not all dolphins can reach 40 years. There are many species of dolphins, and their life span is different with different species. Under normal circumstances, only Chinese white dolphins can live for about 40 years. Other species of dolphins can only live for about 25-30 years, and the longest is no more than 30 years.

Of course, dolphins have different lifespans in different environments. If they live in polluted or small water areas, their life span will also be reduced. In addition, when humans catch other fish, they accidentally injure dolphins, which will also affect their normal life span.

There are many kinds of dolphins, and different species have different body shapes. Under normal circumstances, the length of dolphins will be between 1.2 and 9.5 meters. The smaller species are porpoises, which are about 1.5 meters long in adulthood, and only a few can grow to 1.8 meters. The largest dolphin species is killer whale, which is a large toothed whale and the largest dolphin. Their length can reach 8-10 meters and their weight can reach about 9 tons. Other species of dolphins are also about 5 meters long, and their body shapes are different in different growing environments.