2 books · Ages 5–7 · Chapter Books, Early Readers
Angry Birds Transformers is a 2-book series for ages 5–7 by Ruth Amos. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Deceptihogs Versus Autobirds and Robot Birds in Disguise are great first picks.
No particular order needed — browse and pick what catches your eye.