I saw on Discovery a programme called MythBusters where they take all sorts of stories and add scientific experimentation to reveal wether its plausible.
The team are all special effects experts from accross the water and it is pretty entertaining, anyway, on one episode they take a Piper fuselage from an aviation boneyard and fire different sizes and weight of poultry from various angles and energy directly at the aircraft with surprising results.
With a bit of time on your hands you might manage to find the show online somewhere.
I have hit a pidgeon and a pheasant at high speeds on a motorcycle, the pidgeon badly bruised my hand and dissappeared in a cloud of feathers and guts but the pheasant nearly had me off but not before it smashed loads of plastic and nearly dislocated my shoulder.