I looked after this little chap for a couple of days a few weeks ago.
He was a fledgling who had decided to fledge before he could actually fly! My neighbour found him (I call it a him, it could have been either, but personally I think he's a bloke!) in her garden - between the two of us at the time we knew very little about baby birds - I know quite a bit more now, thanks to the RSPB! I named him Indiana after the intrepid archaeologist, embarking on what could very well be his last crusade!
Untold stress levels occured over the couple of days I looked after him as I learned to recognise his call, and also the sound of the bell on a cat's collar at 6 o clock in the morning! Sorry to my neighbours if anyone got the unwelcome sight of me tramping round the garden in my dressing gown - I'm not mad, honest!
Just as well this little bird could cheep and whistle, because his parents (Goldfinches) heard him and came down (into our hedge where I had put him) to feed. He was there for two days, and I really did try to resist picking him up and sitting him in the palm of my hand. On day one he was there sitting quite happily for a couple of hours, just relaxing, whilst I was agonising over what to do with him. By day two he wanted to be off!!
I'd heard a myth that if you pick a baby bird up, it will be abandoned by its parents because they will smell human scent on it - according to the RSPB this is rubbish, because birds have a poor sense of smell. Best thing you can do is leave them where they are, or if they are likely to be cat prey, move them into a nearby hedge or tree out of harm's way. It's uncanny how their parents find them and how they call to each other... and pretty wonderful too!

By the end of day two he had gone...
Anyway, today I spotted a couple of Goldfinches in the garden, as I'd put some niger seed in the feeder (apparently they really love this stuff!) and I couldn't help but wonder...
Hard to believe that such muted colours would, in time, develop into the most striking plumage! Stay safe wherever you are my little feathered friend!