Murder in the air....

What's this? A bird's dismembered leg and wing on my balcony? What manner of 'fowl' crime (sorry) was this?
How did it get there? Did the murder take place at this scene? Or was another airborne fiend carrying away the evidence of the crime, and happened to drop part of his grisly bundle?
Either way, this isn't the sort of thing you want on your terrace. I'm sure clearing it up will make my roast chicken tonight less appetising...