I am so sorry to share that the Piping Plover egg that was washed down the beach did not hatch. It was all I could do to keep from helping the Dad who was trying to roll the egg into the nest but my actions could have caused major disruptions to the two chicks that had just hatched.
That tiny appendage is a wing bud! From day one, chicks begin stretching their buds This behavior strengthens flight muscles. They spread and flap often throughout the day.