Oh Gosh, I have seen tons of those cakes. Ladycakes site has several. Here are the links. It's a membership site, but it's free for 30 days. take the time to look at the pictures.
Deer Hunter
Deer Cake, Bird watching in chocolate clay
Deer Cake for a hunter
Camo Deer Cake
Another Camo Deer Cake
Deer Hunting cake for someone who has never caught a deer
Here's another really nice one from this site:
Deer Bust
If you Click Here, you can type in the word deer or buck and get back lots of coloring pages to use for ideas.
Good Luck!! 
Here is one I have used so many times with great results. The actual picture of the cake is in the Wilton 2000 yearbook. It is a cake that shows a deer driving and suv with the hunter tied to the top. I didn't use the pan shown in Wilton but did use the picture and put it on a sheet cake. This is one of the most requested cakes I have done. If you do not have the yearbook contact me and I can scan the picture for you. Good luck
In the reply above, the first one "Deer Hunter" is actually a cake I did and it's super-easy!
In the center, I put two small deer that you can get at most cake decorating stores, put a black circle and lines to make it look like you're looking through a rifle scope at the deer. The rest of the cake is just stars randomly placed to look like camoflauge.
This cake was the hit of the party -- they didn't need to know how easy it was! (except for the wrist cramp from all the stars!)
Good luck with your cake!
I seen this awesome one on this site, under theme cakes, after you click theme cakes hit the animal "button" and its #17 of 24. Its awesome!
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