NATIONAL DOLPHIN DAY 2021Each year on April 14th, National Dolphin Day recognizes the social and intelligent mammals of the water. Dolphins are cetacean mammals that are related to whales and porpoises. They range in size from 4 feet to up to 30 feet; dolphins are among almost forty species in 17 genera. Found worldwide, they prefer the shallower seas of the continental shelves. There many sorted /categories mammals are living for more details we can collect from the relevant source .And this day is listed as part of the American Veterinary Medical Association Pet Health Awareness Events.