Phoebe family-feeding fledglings-part3

This is the last clip of the 3 fledglings together. It's interesting that all 3 engage in tail spreading--wonder if this is like yawning for us, a contagious behavior? Note that after the parent bird visits the fledgling on the bottom left on 3 consecutive times (for sure feeding it on one of those times, the other times not clear) that that fledgling decides to try it's hand at catching it's own food. SeEtta