Dolphins evolved from terrestrial animals into aquatic animals throughout generations of evolution. The dolphins share numerous ancestors with the various cetacea. … The evolution of dolphins, or Delphinus, is believed to have started with the Pakiectus, a four legged, land walking mammal.

What is a life cycle of a dolphin?

Life history cycle Bottlenose Dolphin calves are born in the water after a gestation period of one year and suckle for about 18 months. They remain with the mother for about four years. They are a long-lived species, with an extensive life span of up to 45 years.

What caused dolphins to evolve?

The early dolphins were smaller and believed to have consumed small fish as well as various organisms in the water. The older theory is that the evolution was of whales, and they came from ancestors of hoofed land animals that were very similar to wolves and even-toed ungulates.