By September and October, juvenile LBBGs arrive at Westkapelle which differ in jizz (general appearance) from the LBBGs born in local Dutch colonies. We believe they are intermedius LBBG from Scandinavia and the general appearance matches with birds of certain origin (data from colour ring or metal ring readings). These autumn intermedius type of LBBGs can be split in two categories:

1. Warm brown birds, often with a pale first winter head and generally more elongated than the robust Dutch intergrades (see picture b1-b3, especially b1). They represent smaller birds, neckless in their appearance, which are long-winged, with short tibia, slender-billed and often have a more rounded head and friendlier facial expression (not unlike as in Common Gull).
2. Birds superficially like the once described under 1., but slightly bigger and stronger. Again often with a brown tone in the coverts and juvenile scapulars, white-headed, slender-billed, short-legged (short tibia) and long-winged (see b4 and b6). The first winter scapulars may show very pronounced arrow-headed patterns or anchor patterns, but some show very plain dark grey fresh scapulars. It's unknown if these stronger birds are males from the same colonies as the smaller birds under 1., but on average, they are not representatives for Dutch LBBGs and are believed to originate from Scandinavia.

Especially the small birds as depicted in b1 attract attention in a mixed group with (pretty robust) local Dutch gulls and LBBGs from the U.K. and Belgium. As can be seen in the November-December and January Section,  it's not uncommon to find these smaller intermedius type LBBGs in winter as north as the Netherlands (Westkapelle, 51.33 N, 3.25 E).