Monaco
Rollerblading along the road
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It's that posture and head movement that seems like baby feeding motions, yes? With the sound, it could be confused, but I can see how the one on the right doesn't want to be approached much less touched from above like that. Did I interpret that right?
I know it's sounds cute but that is the saddest sound a Pi can make.
If you watch the video you can see that the BH to the right that is making the sound doesn't want to be touch either.
I call that sound a baby anguish sound.
They are making the sound when they are scared/worried and want to remind us that they are babies and not a threat to us and we should be gently to them.
If I had a baby making that sound every time it sees me I would have return it to the breeder. No way that I wanted to put more anxiety to what it already have.
And also I would never hand-feed a baby that was afraid of me if I had other options. That is not a good start.
@rookspook If you can't return him to the breeder, let a avian vet check him again.