© A. R. Dean

An adult LBB with characters indicative of intermedius.  Note relatively black hue of upperparts and limited contrast between wing-point and upperparts compared with adjacent graellsii. See similar individual photographed at the same site in September 2009.
The identification of intermedius is complicated by a degree of clinal variation among LBBG populations and the existence in The Netherlands of intermediate birds attributed to mixing of graellsii from the UK with intermedius from farther north. The validity of intermedius as a subspecies is sometimes questioned.