I don't think any JW has really thought about whether any of this stuff is even possible let alone true.
It doesn't make any sense, but look at how many JW's there are that are buying it.
As far as the bird thing goes, I remember that whole story when I was a kid and I was really scared. We lived on a farm and there did seem to be so many crows, magpies and hawks.The hawks would attack you and the magpies would eat our baby rabbits. So you can imagine the images of flesh eating birds after the big A going through my mind.
Moanzy