Rat dragons are neutral mobs that can we tamed and ridden.
Spawning[]
Rat dragons will spawn in Nether.
Behavior[]
Rat dragons will fight back if the player attacks one.
Taming[]
Rat dragons will be tamed by feeding them Cheese.
Usage[]
If a player uses a saddle on a rat dragon then the player will ride it.
Riding[]
The player can ride a Tamed Rat Dragon by putting a Saddle on it.

A player riding a Rat Dragon.