What are the biggest deer hunting nuisances? Mine has to be red squirrels. The locate me, look me straight in the eye, and proceed to screetch "he's here, he's here" in squirrel language to everything in the forest. At that moment I want all red squirrels on the planet to die horribly and painfully. (The feeling passes, usually sometime in March)

Anyway, if you don't have red squirrels, what's your biggest deer hunting nuisance?