OK, we're going to shift gears and talk about a non-oak species. Persimmons are as close as a deer gets to candy. They usually don't grow in large enough quantities to qualify as a significant foodsource for deer, but if you find a large enough tree - or better yet, a cluster of large trees - you can be in for some fine hunting if the fruit is ripe and the deer have found them. I have to admit, when the persimmons are ripe, you're likely to find me feeding under a tree. Just make sure they are good and mushy, or you are in for some serious puckering.
Unlike most trees, persimmons are either male or female and only the females produce fruit. If you are exploring new hunting ground early in the year, before you can see developing fruit up in the tree with your binoculars, you can determine the sex of the tree by checking closely around the bottom of the tree, directly under the bushiest limbs. You are looking for dried up calyxes (or caps) and seeds like these:
When you are looking, brush back the top layer of leaves because the fruit usually falls from the tree before the leaves do, so the evidence you are looking for tends to get covered up. If you are scouting in the mid to late summer, here's what you are looking for (with binoculars).
fencerows. They tend to grow in clusters with trees of the same sex.
Persimmon leaves are oval-shaped, dark shiny green above and light green below. They are pretty non-descript and aren't all that helpful in identifying the species, except when glassing the edges of fields, where their dark green color combined with the tall slender shape of the tree can be recognized from a distance.
Persimmons are green to light orange before they ripen, becoming dark orange when ripe. Usually, the first frost will cause the fruit to quickly ripen and fall soon after, although some trees will produce ripe fruit much earlier in the year.
If you are looking for a handy field guide that you can throw in your pack the next time you are out scouting, I recommend either or both of these books. I use both because often one will have a better photo or illustration than the other and two points of reference always helps. If you don't want to spend the cash for two books, I'd give a slight edge to the Peterson's Guide.