Internal and external skeletons of animals, functions, examples

It can be logical to understand that the internal skeleton is located inside the animal’s body under the muscles and skin. The outer skeleton is not covered with skin and muscles. The outer skeleton is found in a rhinoceros – a horn, an armadillo – a thyroid covering of the body, crustaceans and others. They have a shell outside the body or have a mixed type of skeleton. A person has an internal skeleton, since the bones do not come out of the skin. But there is no need to confuse teeth and skeleton. Teeth are not skeletal. They have a completely different nature of origin and structure.