If you're concerned about cats or predators, move it to a safe place, like a bush or low branch. It's a myth that the mother won't return to a baby bird after a human has handled it. Occasionally young birds fall from nests. A fallen nest with eggs can be placed high in a shrub or tree. But a fallen egg is probably a lost cause.
People occasionally find baby deer in the woods.
Deer, like rabbits, leave their young alone for long periods of time. But if you know the mother's been killed, contact the Game Commission. Brittingham urges people to remember that they can be injured aiding wildlife. Animals sometimes bite out of fright. To avoid being bitten or scratched, she suggests being cautious and wearing gloves.