Dolphins give names to each other.
Dolphins can speak to one another in complete sentences of up to five 'words.'
male dolphins nurture a lifelong “bromance”, serving each other as a wingman, helping herd fertile females and sometimes even team up to keep females from mating with other males.
Sloths hold their breaths longer than dolphins.
Dolphins have names for one another.
When a dolphin was given LSD (1961) and had contact with another intelligent mammal, it wouldn't shut up.
Wild dolphins call each other by name.
Dolphins create their own unique vocal whistle which other dolphins can mimick to get their attention.
Dolphins have been known to use sponges to protect their snouts from damage while searching for food.
Dolphins can kill sharks by ramming them with their snout
Dolphins can swim 60kmh (37mph)
Dolphins are the only other species that are documented to have sex just for pleasure and not just for procreation.
Dolphins can hear underwater sounds from 15 miles (24km) away
Marine mammals swim by moving their tails up and down, while fish swim by moving their tails left and right.
Dolphins don't chew their food. Their teeth are only used to grip food and they'll shake and rub it on the ocean floor to tear it into smaller more manageable pieces.
Bats and dolphins independently evolved echolocation in the same way (down to the molecular level)
Dolphins sometimes use decapitated fish to masturbate.
Dolphins use their lower jaw for hearing.
Dolphins must keep conscious when sleeping. Their breathing is not automatic so they would drown if they lost consciousness.
The dolphin, Flipper, from the 1960s television show, committed suicide.