Fur or feathers line the spine from the back of the neck to the middle of the tail.

The fur can be any style or texture.

Cannot fall past the shoulder blades.

Can combine with the Hair mutation/Coat Traits to negate the length rule.

Short triangle-shaped bone growths line the spine. 

The tips can be sharp, blunt, or hooked.

The vertebrae on the back extend upwards, giving a "mountainous" appearance. 

Long, thin barbs of cartilage line the spine. 

They can be pointed or blunt. 

They cannot exceed the length of the snout.

Long spines are connected by a membrane that lines the back. 

The spine has grown a sail, surrounded by meat and muscle.

Can appear segmented and bony, or solid with muscle and fat. 

The sail can be uniform or split. 

Can appear similar to spinosaurids, carcharodontosaurids, bison, etc. 

The sail can help with heat regulation, fat storage, and increased strength.

Large plates made of bone line the spine, resembling those of a stegosaurus.

Can have up to 2 layers of plates next to each other for a total of 4 lines all together.

Can exhibit different simple ‘shapes’ such as stars, squares, circles, etc.