Why do snakes have leather shells?

Snakes do not have leather shells; rather, their skin is covered in scales made of keratin, similar to human nails. These scales provide protection, aid in locomotion, and help prevent water loss. The texture of their skin can vary, giving it a leathery appearance, but it is not a shell like that of a turtle or tortoise. The unique structure of snake skin allows for growth and shedding, which is essential for their development.