The Physics of Angry Birds

From Wired :

You know the game, I know you know. Angry Birds. […] Well, the basic idea is that you launch these birds (which are apparently angry) with a sling shot. The goal is to knock over some pigs. Seriously, that is the game.

But what about the physics? Do the birds have a constant vertical acceleration? Do they have constant horizontal velocity? Let’s find out, shall we?

Well, I didn’t understand a thing, but it makes for a fun read.