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Dolphins can sit in boats

Dolphins, turtles, fish, guardian and elder guardian do not really try to get into the water

Dolphins do not drop cooked cod when burned to death

Dolphins keep gathering in a corner

Dolphins can not be fed fish

Dolphins are sometimes rendered offset when jumping on land

Pufferfish doesn't attack aquatic mobs

Over a 1000 dolphins spawning in a range of 100 blocks at a certain height

Guardians and Elder Guardians don't attack dolphins, turtles or fish

fish bounce too slowly on land in superflat world

Angry dolphins give players dolphin's grace

Dolphins don't save how long they have been out of water

Dolphins can't prevent themselves from taking fall damage

The tag that specifies how long a dolphin can stay out of water isn't visible / written to NBT

Dolphins ignore buried_treasure structures and lead to pre-raided structures

Stranded dolphin tries to catch the boat on the water and stops beating

Dolphins get stuck when trying to jump from one pool to another

Dolphins Beaching Themselves

Minecraft Dolphins die. Period.

Dolphin freezes in place

Dolphins Grace Effect Does Not Show While Swimming Near Dolphins

dolphin is die on land

Dolphins do not attack back (not a duplicate of MC-187909 it is different)

Interaction between dolphins and falling objects

Leads can be re-attached to a dolphin, leaving the original lead knot behind