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This forum is for advice about initial treatment given to your injured/sick bird until a qualified avian veterinarian is available. THIS IS NOT MEANT TO REPLACE VET CARE
This probably isn’t helpful but I immediately wiped it off and washed it away. But it was wet, maybe faintly yellow/transparent and had some whole pieces of his normal pellets (Zupreem fruit blend). He has recently eaten a Nutri-Berry. I’m wondering if he hasn’t been chewing his food well? It looked like he was just adjusting his crop and then he leaned forward and plopped it out. He adjusted his crop two more times but nothing came out, and now he’s just flying around like normal.
This is pretty gross but here is a video of a Military Macaw regurgitating close up. If you start watching at around 2:20 you will get the idea on what it looks like.