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@e5c4p3artist
@dc228 – Completely unscientific opinion based on my playing; I have not run actual numbers.
But I feel that it is more cost efficient to level up 3-star bird to 20 (using 1&2 star birds) and evolve it, then feed it to a 4-star bird which will gain around 6-7 levels from it, than to directly feed the 1&2 start birds to the 4-star bird.
Again, based totally on what I am seeing/feeling by the way I play the game, but not by crunching actual numbers. Because I am too lazy to spend the time to do that. :P