cgeoff

This looks like a second calendar-year male, one that hatched last year. The yellowish super is showing, and black feathers are present at the bill base, ear coverts and wing bend.

Unlike females, there is no brown tinge to the tail, so presumably this was moulted in the winter.

GeoffC

cgeoff

Actually, I'm now wondering it maybe it's owstoni. The yellow appears to meet over the bill base, which fits owstoni better. The fringes to the tertials are also rather prominent.

GeoffC