I saw some flickers learning the ways of the world on my bird surveys the other day. Even though that baby looks full grown, he's still hoping to be fed by the adults. Old habits die hard.
This appears to be a little bit of some father son bonding (they are both male, they both have a mustache).
The adult male didn't feed the younger one, but flew off, presumable to teach the younger bird where to forage for food on its own.