This video from Bermuda says about itself:
4-day-old Cahow Chick Flaps Wing Nubs, Pokes Around Nest – March 3, 2020
At 4 days old, the Bermuda Cahow chick is already spending time in the nest alone as its parents search for food in the Atlantic Ocean. What does a nestling do with all that down time? Let’s try working out those wing nubs and sprucing up the place with some rearrangements.