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Echo still has a popping noise from her chest which is louder after flying. She had been to an avian vets who think she is fine. Any ideas. She acts healthy and no heaving or stuggling to breath and still chirping away
Heavy exercise or a fear response can cause heavy breathing in our 'toos that makes some noise. It's a quiet "thunk ... thunk ... thunk" sound that I think is made by them pumping their body cavity like a billows to fill up the posterior air sacs.
Here's a video that does a pretty good job of explaining avian respiratory anatomy:
If it's happening all the time, that might be cause for concern.