Dolphin is a common name of aquatic mammals within the infraorder Cetacea. The term dolphin usually refers to the extant families Delphinidae, Platanistidae, Iniidae, and Pontoporiidae, and the extinct Lipotidae. There are 40 extant species named as dolphins.
Speed: Short-beaked common dolphin: 60 km/h
Phylum: Chordata
Lifespan: Killer whale: 29 years, Striped dolphin: 55 – 60 years, Short-finned pilot whale: 45 years, more
Mass: Killer whale: 3,600 – 5,400 kg, Common bottlenose dolphin: 150 – 650 kg, more Encyclopedia of Life
Gestation period: Killer whale: 15 – 18 months, Common bottlenose dolphin: 12 months, more Encyclopedia of Life
Length: Killer whale: 6 – 8 m, Common bottlenose dolphin: 2 – 4 m, Striped dolphin: 2.6 m, more
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