Skull bones protect your brain.
so that they can blend well in their surrounding and protect them from other animals.
skin
Lions do not have predators except for other lions and human beings. They protect themselves from humans by hiding and running when they see us. They protect themselves from other lions by either doing the same thing, or by fighting the other lions.
the spinal cord
the head
Eyelids and Eyelashes.
Its exoskeleton.
Your hands! :P
by wings
scales
I, personally, am dong nothing to help lions.