Okay, immediately this game popped into my head and I think you can easily make it Angry Bird-ish! Bear with me as I explain the rules, but it's called the sock game. You will need lots of pairs of socks and a big wide open area.
First, spread the balled sock pairs all over the playing area. Pair each girl with a partner. Blindfold one partner. The blindfolded partner has to be the one to find the socks and throw them at the others. The unblindfolded partner has to give directions and tell them where to throw, when to duck, where to find the socks, etc. This is a traditional team building game, but honestly, it is really super fun and I've played it with adults and everyone loves it!!
If either member of the partnership gets hit with socks the team is out. Last team standing is the winner. You could easily pretend the socks are the birds and the partners are the pigs. It could be pretty fun! Also, you can just play it over and over again and it really doesn't get old that fast! ;)
For breakfast I'd see if you can't go with an egg theme, it relates to birds! ;) You could do a toad in the hole and it looks a little like an egg in a nest. Or if you're really feeling creative make some pancake batter, dye it a color of one of the birds and then add a little black gel frosting to each pancake to give it some Angry Bird like features for a face. It wouldn't take long and each girl could get one bird pancake and then you can just make extra plain ones.
If you have old Easter eggs lying around, you could use those in your scavenger hunt too...I know it's not "angry" but it's birdy! ;)
Hope that helps!