That just doesn't track for me. I'm no entirely sure what it is he does all day when he's not at a shit bar drinking piss but bird watching doesn't seem like a thing he'd do. He does play with Legos and Funko Pop shit but that's all inside, not to mention that across the road from the ghetto in a big city is probably not a good place for birds, unless you enjoy pigeons I suppose.
I can believe that bird watching would be something his second, better wife used to enjoy, before she settled with Fat and started heavily medicating herself. But then again that would mean Fat made a bit of a gesture and I can't really see that either.
Can't be anything a friend recommended because he has no friends so could it be just some random shit he picked up when he sobered up enough to remember what day it was? Yeah, without more info going with the last one, it's some random shit he picked up in a panic to placate his wife who has been losing weight and taking somewhat better care of herself lately after things have been going downhill for him.