GREAT BLACK-BACKED GULL, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

   We can tell the gull in the first photo is a Great Black-backed Gull, rather than a Lesser Black-backed Gull by comparing it to the two American Herring Gulls in the second photo.  It is larger than the two American Herring Gulls, thus indicating it is a Great Black-backed Gull rather than a Lesser Black-backed Gull.

 

AMERICAN HERRING GULLS, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

 

RING-BILLED GULL, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

 

GREAT BLUE HERON, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

 

BREEDING MALE MALLARD, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

 

BREEDING MALE NORTHERN SHOVELERS & FEMALE NORTHERN SHOVELERS, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

 

BREEDING MALE & FEMALE COMMON MERGANSERS, WINDERMERE BASIN, HAMILTON, ONTARIO, 12/20/2025

   The first photo shows a breeding male Common Merganser; the second and third photos show breeding females;  the fourth photo shows two breeding males on the left and two breeding females on the right and the last photo shows a front view of a breeding female.