It's a baby bird! When the weather cooled off, I put a nest in for each of my pairs of finches. The fawn hen laid some eggs, which I didn't really pay attention to. I noticed she was chasing and pecking the other cock, so I put the separator into the cage and separated the 2 pairs. Today as I gave them water I noticed something move, and they have a chick. It is at least a couple of days old, I would guess. You can see the crop is full of seeds. Come see if you are around!