The boy took the white duck's egg and lay it under the red hen.
The egg hatched.
The boy cared for it, fed it, changed its stinky bedding.
Mom and Dad say it's time to join the flock.
Boy takes it to flock to socialize it with its own kind.
4 free ranging female ducks
and its own egg laying mother takes notice, and begins to welcome him/her in.
A story unfolds...