I thought it looked like an immature just because it didn't appear to have full adult plumage, but I'm sure you have a more advanced, for want of a better term, reason !
Looks like a juvenile to me -- slightly unfinished look, difficult to put my finger on, but it's this year's young. Possibly lost, even maybe hand reared and looking for people?
I thought it looked like an immature just because it didn't appear to have full adult plumage, but I'm sure you have a more advanced, for want of a better term, reason !