Monkey found a Baby Bird

Monkey found a baby bird laying on the ground yesterday. Poor little guy appeared to be hours old, but we could not find the nest anywhere. We followed the advice of a local bird rehabilitator and made a make shift nest using a basket, then we hung the basket in the tree that was nearest to where the baby bird was found. The hope was that the mother bird would be looking for her lost baby, and would care for it in the makeshift nest. I watched the nest for quite a while, but never saw the mother bird come, so I called the rehabilitator to ask her what should be done. She said it was a tough love situation, and that the best option was to leave the baby bird in the make shift nest, because his best chance of survival was with momma birds care. She thought there was a pretty good chance that the mother was afraid to come around, because I was nearby. The tough love part was that there was always the chance that the mother had died, or just could not get to her baby for some other reason. I followed her advice and left with the hopes that the mother bird would find her baby, or that another bird would adopt it. It has been almost 24 hours since Monkey first found the bird, and I have not had the fortitude to go look inside the nest; if the mother bird did not find him, he would have passed away by now.