sentences: shelter is a kind of place / building / structure for protection & animals usually live in protected places ->  a shelter is used for living in by animals  a shelter is used for living in by animals & a raccoon is a kind of animal ->  a shelter can be used for living in by raccoons  a shelter can be used for living in by raccoons & some raccoons live in hollow logs -> an example of a shelter is a raccon living in a hollow log