Answer:
What has a head, a tail, is brown, and has no legs?
What comes down but never back goes up?
What has a foot but no leg?
They come to witness the night without being called, a sailor's guide and a poet's tears. They are lost to the sight each day without the hand of a thief.
Dry though I may be, I am still a sea.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.