Tommy Thompson Park Route, Toronto, 20 December
Tommy Thompson Park CBC Team Left to
right: Ralph Toninger, Toronto and Region Conservation (TRCA), John
Carley, Jean Iron, and Carl Hills on 20 Dec 2009 at Ashbridges Bay
Wastewater Treatment Plant. Photo by Peter Lister.
Adult Thayer's Gull in winter (basic)
plumage. The mantle shade was slightly darker than the nearby
Herring Gulls. Its eyes were dull greenish-yellow and were darker
than the bright lemon yellow of the Herring
Gulls. Ashbridges Bay Wastewater Treatment Plant in
Toronto on 20 December 2009.
The undersides of the
primaries were silvery white with the grey shadow of the black upper
primary markings. Ashbridges Bay Wastewater Treatment Plant on 20