Dolphin

Dolphin is the common name of aquatic mammals within the infraorder Cetacea. The term dolphin usually refers to the extant families Delphinidae, Platanistidae, Iniidae, Pontoporiidae, and the extinct Lipotidae. There are 40 extant species named as dolphins. 

Class: Mammalia

Phylum: Chordata

Kingdom: Animalia

Infraorder: Cetacea

Lifespan: Orca: 10 – 45 years, 

Striped dolphin: 55 – 60 years, 

Pantropical spotted dolphin: 40 years, 

Short-finned pilot whale: 45 years