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.]
(..) Just hold it a minute, Grandpa. Grandpa Munster: At a time like this, you're taking pictures? Herman: I just couldn't help It. You look so natural slitting In that box. Put me behind the wheel of that bitch, I'll show you drivin'. You useless fuck. You couldn't even get your big ass in that seat. (..)2003 House of 1000 Corpses