Mammals can maintain a constant body temperature.

He broke his leg bone.

The baculum is a special bone found in many mammals.

He broke his leg bone.

Many ancient bones were found in this ancient ruins.

Bones of ancient people were discovered from this ruins.

He spends a lot of time studying.

He reads a lot of books.

He broke his thighbone in a skiing accident.

He broke his radius in a skateboard accident.