Why does a tiger parrot stretch its wings when I mention a cage?

It’s very simple, because the birdcage moves and it needs to maintain balance! If you don't move the birdcage and they still stretch their wings, they are stretching. When stretching, he stretches one wing and the leg on the same side. When maintaining balance, both wings are quickly extended at the same time.

If you don’t believe it, give it a try!