Editing Guide to Taming and Raising Pets (section)

== Pet Eggs ==
Once a monster has been tamed by a Venomancer it reverts to an egg. This is called a pet egg, and is where the distinction between a "monster" and a "pet" can begin. These eggs, which can be hatched at a Pet Skill Trainers or Pet Managers, will no longer be monsters, but will be referred to as pets, and upon hatching will be placed immediately in the Pet Bag. It must be noted that it is possible to carry as many pet eggs as there is available space in the inventory, however eggs cannot be hatched if there is not adequate space available in the Pet bag.  (Note: Hatching pet eggs will incur a fee, starting at 200 coins or greater, depending on the pet.)

Pet eggs are not restricted to monsters tamed by Venomancers, other creatures that arrive in pet eggs include baby (non-battle) pets, mounts, and legendary pets traded for Source of Force or Phoenix Feathers.