why would it be? Cows don't smoke ..... :winkold:
on the flip side, i'd say no, Grant.
I'd say it was essential to their existence. Not "valuable", as it has no actual "value" as such.
Needed/required, rather than valuable, would be my take on it.
I think you are being very narrow in your definition of value, Jon.
Why does food not have value to an animal?
Does food have a value to a human? Other than pounds, shillings and pence?