The cat in the apartment above me attacked and got a nest of baby sparrows. I went to look in at them today and the nest was gone. I found both babies on the ground alive. The people took the nest. So I got the nest back and put the babies back in it and put the nest back where it was. But the mommy hasnít found them yet. They are still alive but no one to look after them what should I do? This was about 4-5 hours ago. Should I just leave it and hope for the best or keep an eye out on them?