It might be a juvenile budgerigar or a smaller bird species that happens to be present in the same area

Hi Mel, Thanks for the question! Perhaps you can reveal the name of the bird now?  Thanks!

Under the right guy's wing - but what is it? And where is it? Australia? North American zoo?

If you could tell the place where you saw it, it would be a great help to identify it.

I see it, though I do not know what it is. I don't think it is a catbird. To me it almost looks like a thrush or thrush related bird.

The eye expression and black beak make me think catbird?

I see it on the right at the end.  Haven't a clue what it is.

I see it too! Can someone identify this bird (species)? I'd like to know what kind of bird that is!

right hand corner above the last budgie that's drinking and under the wing feathers of the one above it!