Photo 4: sub-adult LBBG, October 13 2001 Westkapelle, the Netherlands.
A sub-adult LBBG, probably in 4cy. Note the delayed moult in the primaries, compared to the average 3cy LBBG: p7 is still old. P7 shows an indistinct division between the grey-brown centre and the black upper half with a faint abraded white tip. Note the extreme old brown inner lesser coverts and central greater coverts, obviously contrasting with the plain shiny grey feathers.