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This question already has an answer here:

What runs but never walks,
has a mouth but cannot talk,
has a head but doesn't think
and has a bed but refuses to sleep?

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marked as duplicate by Rand al'Thor, Gamow, Len, Ry-, Tryth Mar 8 '15 at 22:00

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I think it is:

A river

The reason:

The river runs, river mouth, river head, and river bed

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