Skeletons don't have a gender. Skeletons being able to Carry and Sire offspring at the same time.

Instead, Skeletons decide who will become the Carrier from their spinal cords. More specifically the spinous process of vertebra.

When a Skeleton becomes a Skele, their magic begins to properly develop.

When their magic develops it changes how they look.

Height and size of a skeleton doesn't matter to on how strong they are.

The spinous along the spine usually grow out longer if the Skeleton has strong magic. This is mostly shown in the neck. Tails are a rarer sign of strong magic.

Weaker skeletons have flatter vertebra and almost never have sharp claws or tails.

Contrary to what most would think, the weaker Skeletons are not the ones who Carry the offspring. It's actually the ones with Stronger magic.

This is because Carriers usually take care of the offspring alone and need to protect their young.

So when Skeletons mate, the one with stronger magic will almost always become pregnant.

Skeletons with equal magic have a chance of either becoming a Carrier.