He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) too old to be caught In the first place. Then you put him in a dolphin tank alone. He's not a natural performer, And you expect me to work miracles? We pay you to train him, not analyze him. These are not the (..)1993 Free Willy
(..) Excuse me, lady. Excuse me. My friends and I are having a problem. You see, we spent all our money at the natural history museum, And we have to take the ferry home. Think you could help me out? I suppose. (..)1993 Free Willy