I had a pigeon (racing variety) take a dive thru my rotor disc shortly after landing once.
An explosion of feathers alerted me to the event, and after shutting down I found the two halves of the doo perfectly severed about 20yds apart.
Thinking the owner might be wringing his fla'cap in anguish at the disappearance of his "fancy" (!) I passed the details of the unfortunate bird's leg ring and the circumstances of it's demise to the Pigeon Racing Society or whatever it is called (who were totallt uninterested) and heard...absolutely sod all.
Now I don't swerve for doos, Malibu Storks and above only.