After another long stint of incubating, Rosie has decided that she wants to stretch her wings.
By chance, I happened to see an amusing little sequence outside Box3.
Before she has actually left, along comes Will.
Rosie immediately guesses that he has come to feed her, and here you can see her beak open, presumably as she asks for the food.
Will leans forward ...
... and feeds her!
The job done ...
... Will flies off ...
... immediately followed by Rosie!