Handling Baby Birds
Another misconception via Snopes.
I worked at the zoo for a summer and people called all the time that their kids touched a baby bird. The standard response was "Leave it alone and keep your cat inside."
The zoo called a neighbor of my mom about putting a baby owl in the owl's nest in his yard. The parent owls accepted the new baby without a fuss.
I guess if there were any truth to this cowbirds would be extinct. And we could get rid of pigeons by spraying their nesting areas with dust with human scent.