This subject freaks me out a bit, so what do I do, make a cartoon of it of course. I talked to some bird lovers who know more than I do about birds, they thought that the birds are eating too many fermented berries. So basically they are drinking them selves to death. I don't know if I believe that, but it kinda makes sense. The other thing I thought about is this probably happens all the time, we just don't hear about it. Who knows, but to me it is still a bit creepy.
