This would be my fantasy southern Ohio research project:
Pick out a relatively small area of woods for the study, say 100 x 100 yards Map it as a grid, inventory the tree species, measure trunk circumference at chest height (CBH at 4.5'). Note geologic, topographic and soil type features. Note understory make up (species mix, characteristics). Ok, with this baseline plan your study focus.
An idea:
Observe native breeding birds from May thru July, Observe nesting, foraging and other behaviors in the canopy. Are there differences in the species mix and behavior in the crowns of mature large trees in your plot vs. younger successional trees. Can you draw conclusions about preferences, habitat etc.? Do birds from other territories (not nesting or controlling territory in your plot) visit to forage? Which species and age trees attract which birds, is there a difference? Look for nest parasitism and nest predation by other avian species, any patterns to note in regard to different age and size trees?
To extend the study July thru September observe what happens with post-breeding dispersal, are there new bird species moving through your study plot? Which trees are they attracted to?
To do this you would want to spend many hours sitting up in the forest canopy observing and taking notes, sounds horrible!
You would need a pair of binoculars and the interest to learn woodland bird species. In my experience there is nothing more conducive to learning about birds than hanging out in trees!
-AJ