One time when I was a volunteer firefighter, we were hanging around the firehouse. There was a baby bird that fell out of our quite tall pine tree. The nest was near the top. I ended up putting rubber gloves on before picking the baby bird up. I climbed a ladder and put the baby back in the nest. No human scent, back home and happy. The End.

It is true that once they sense a human touching their young, they will throw it out of the nest.