Various types of dolphins are 4-30 feet(1.4-9 meters)long. They weigh from 100 lbs. (45 kg) to 5 short tons (4.5 metric tons).

Familiar types of dolphins are:

1. bottled-nosed dolphins: Tursiops truncatus lives in all oceans. Length is up to 15 feet(4.6 m)
2. common dolphins: Delphinus delphis lives in all oceans. Length is up to 8 feet(2.4 m)
3. common porpoises: Phocoena phocoena lives in all oceans. Length is up to 6 feet(1.8 m)

Other Types of Dolphins

1. Dall's Porpoise Phocoenoides dalli lives in the Pacific Ocean. Length is up to 6 feet (1.8 meters).
2. Pilot Whale Globicephala melaena lives in the Atlantic Ocean. Length is up to 20 feet (6 meters).
3. White-sided Dolphin Lagenorhychus acutus lives in the North Atlantic Ocean. Length is up to 9 feet (2.7 meters).
4. Common Porpoises Phocoena phocoena lives in all oceans. Length is up to 6 feet (1.8 meters).
5. Killer Whale
Orcinus orca lives in all oceans. Length is up to 30 feet (9 meters).

Some kinds of Baleen Whales

1. Blue Whale, Balaenoptera musculus, Up to 100 feet (30 meters) long
2. Gray Whale and Calf, Eschrichtius gibbosus, Up to 50 feet (15 meters) long
3. Sei Whale, Balaenoptera borealis, Up to 55 feet (17 meters long) long
4. Black Right Whale, Eubalaena glacialis, Up to 60 feet (18 meters) long
5. Fin Whale, Balaenoptera physalus, Up to 80 feet (24 meters) long
6. Bowhead Whale, Balaena mysticetus, Up to 60 feet (18 meters) long
7. Minke Whale, Balaenoptera acutorostrata, Up to 30 feet (9 meters) long
8. Humpback Whale, Megaptera novaeangliae, Up to 50 feet (15 meters) long