Angry Birds: NZ/Unused Content

Pig ‘N Mix
Pig N Mix was introduced at the start of the game. It showed 3 bird options, and people chose which bird they wanted to sling. This was removed in update 1.2.7 to increase strategy.

Waves
Waves were introduced at the start of the game, which meant multiple structures with different birds (although remaining birds on completed waves gave points). It is now only occasionally used in levels and is sure to die out soon, however wave levels will still exist.