Wild animal parents are usually nearby. Put songbirds back into their nest or put them in a makeshift carton and nail it to the tree. Juvenile birds go through a period of hopping before they fly. Let them be. Keep your cats and dogs indoors for a week.
Rabbits feed their young only twice a day.
The rest of the time they are foraging nearby. Deer also will leave their young almost all day to forage. The animal has a bad limp. It is on the side of the road and not moving away from traffic. It is seriously injured.