ML283059701
Common/Short-billed Gull Larus canus/brachyrhynchus
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Initially found at 16:42 and lost it around 16:47 while I was trying to move to the South of the bird and get a direct profile view of it. Standing by itself at this location (180m from my observation spot): 43.276694467714925, -79.86653825110241 Most gulls were on the wharves parallel and East of where this gull was (approx 30-40 m further away). An adult RBGU briefly landed next to the MEGU for about 15 seconds before flying away. Approximately 2000+ gulls were at this location when I first arrived but were flushed before I started scanning through them. Less than 25% of the birds returned after the initial flush, and by the time I left there were only 100-200 gulls remaining. This is one of my higher counts of gulls for this location for me, some evenings there are only 100-200 and on other evenings there are thousands. I haven't noticed any association with weather conditions. Was scanning the flock from Left to Right when I landed on this gull and immediately noticed the thin bill with a very faint mark towards the distal third of the bill. The size and yellow legs immediately indicated that this was a MEGU. I zoomed in with the scope and noted the wide tertial crescent and large mirror on what I assume was the underside of P10. The mantle shade was difficult to judge as it was getting dark. When the RBGU stood nearby there was not an obvious difference in mantle shade, which would be atypical for MEGU - but is probably due to the lack of daylight. It was slightly smaller in size to the RBGU - however, at this point the bird was laying down and the RBGU was standing so it wasn't a perfect comparison. The bill differences were easy to pick out despite the distance and lack of light, including the slightly duller yellow colour to the bill (the photos make it appear more dull to greyish than in real life). The eye seemed dark but was probably related to the duskiness in the feathers around the eye rather than the iris itself (too dark and distant to truly see the iris colour). Looking at photos of the Brantford bird, I think this bird has more streaking/smudgy markings in the face and top of the head, and the bill markings confirm it is a different individual. No spread wing shots as I was documenting the bird with my phone through my scope at 20-60x. Unable to determine sub-species based on todays views. 19 Aug: Updated sighting to reflect recent change in taxonomy (previously reported this as a Mew Gull). I personally think this bird was a Common Gull but can't be 100% sure of that.
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