easywhat am-i

What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
Common Wrong Answers
“A clock”
While a clock runs to show time, it does not have physical features like a bed or a mouth, and it does not murmur.
“A car”
A car runs but it walks in the sense of moving; it doesn't have a mouth or a bed as a river does.
“A computer”
A computer runs programs but does not have a bed or a mouth, and it does not murmur or talk in the natural sense.