Albert de Jong
Larus cachinnans? 8CY KE16 May 30 2012, Shabany, Belarus (53.49 N 027.41 E). Picture: Dmirty Goncharov.
Red KE16 ringed as pullus on June 23 2005, at rooftop breeding colony st. Mashinostroitelei, Minsk, , Belarus (53°49'.00"N, 27°42'.00"E).
Bill and head structure within limits of cachinnans, but overall also recalling argentatus. Could be hybrid, hatched in mixed colony.