Although not an avid Angry Birds player, my 3yo son is and has told me that the red bird does indeed do something when the screen is tapped. In fact, when he told me what happens, I had a difficult time believing it, even when trying it multiple times myself. But now, it is crystal clear to me.
Turns out my son has found something about Angry Birds that I have not seen anyone else find. Most (if not all) people think when you tap the screen while the red bird is airborne, nothing will happen. That is not entirely correct. The red bird makes a sound similar to “peee-kaaaaa!”
The moral is the obvious one – don’t dismiss an idea because of the messenger or because you think you may know better.