Not particularly the right thing to do and unfortunately no happy ending, but I have a little anecdote to relate to your predicament….
Living in a Peak District village as a youngster (probably 9/10yrs old), I found a chick that had fallen out of it’s nest and naively took it home. My parents advised me to take it back to where I found it and see if the mother came to find it.
I did take it back and after what seemed like forever (but was probably about 5 minutes) there was no show, so I trotted off home with said little birdie. I fed it bread, milk & worms and it lived with me in my bedroom quite happily in a cage for a while.
I even went on a camping trip from home with my parents (about a 4 mile walk from the house to a stone circle for Solstice – parents being hippies and all that). The bird either sat on my shoulder, or flew and hopped a few paces in front of me all the way there and back and even stayed in my tent.
The unhappy ending unfortunately came when we were back at home and lay in bed one night with the bird out of it’s cage – I fell asleep, only to awake in the morning to find that cuddling the bird I’d inadvertently smothered it under my duvet.
I was totally distraught and 30 years on it still saddens me.