It's kind of like when you visit your favorite all you can eat buffet style restaurant. You pick along here and there sampling a bit of this and a bit of that until you get to whatever it is you decide to fill up on, then you fill your plate and begin to get serious about eating until you have had your fill. On the way out, you pick up a bit of desert just to finish it off. The list of things deer eat is a lot longer than the list of stuff they wonteat.