These adult Lesser Black-backed Gulls (Larus
fuscus ssp.) - seen here with a 2nd-Basic Yellow-Legged
Gull (Larus (cachinnans) michahellis) - were among a group
of 150+ similar birds observed at Milton Landfill, near Cambridge,
England on March 10, 1999 by Martin Reid. In the field the mantle
tone on almost all the birds looked far too dark for graellsii,
and most birds seemed to show a primary extension close to or
matching intermedius (as with the left bird here). One
local gull expert thought that most of the birds could all be
"Dutch intergrades", or even mostly full intermedius:
