Three-band clownfish is the signature fish of the Disney Nemo cartoon.
This fish lives in the anemones, it is immune to their poison thanks to its mucus, anemones serve as a protective house.
The three-band clownfish is hermaphrodite, so it can change sex according to the needs of the inhabitants of the anemone.
Some sharks can stay motionless on the sand (white tips reef sharks, nurse sharks, etc.).
These sharks don't have to swim to bring oxygen to their gills like other sharks (grey, hammerheads tc.)
Parrotfish create a protective envelope around them when they are sleeping.
So, don't put the light on them during night dive to don't to wake them up and break this envelope.
Mammals have a horizontal tail.
Fishes have a vertical fin.