Dolphin

Dolphins are a small group of toothed whales, which often has species like this

Orca
Main Page: Orca

Orcas also known as killer whales, eat prey, such as seals, fish, penguins, polar bears, seabirds, walruses, squids, sea turtles, crabs, sea lions, otters, and whales such as fin whale and blue whale. These mighty predators grow to 28 feet (8 m) long and weigh four tons.

Pilot Whale
Main Page: Pilot Whale

Pilot whales mainly feed on squid at the ocean bottom, in the Midnight Zone, their diet is like Sperm Whale's. The short-finned pilot whale grows 18 feet long in length.

Relationship With Humans
Dolphins have been known to save drowning sailors. One dolphin as present, Flipper. However, most dolphins today are in captivity, such as orcas. The smallest dolphin tank held two pantropical spotted dolphins, three before that one died at a 0.3 meter deep tank. Lolita is an orca at Miami Seaquarium which holds a 60 by 80 tank in diameter, the narrowest spots are 35 feet and an illegal at 20 feet deep. She must share it with four pacific white sided dolphins after her partner Hugo died.