'Interesting Gulls' at Point aux Prairies

Glaucous Gull Larus hyperboreus top left, Iceland Gull Larus glaucoides in the water. Note the size difference and head structure

  As Dan and I were leaving the Point aux Prairies Park yesterday we spotted a large raft of about 300 mixed gulls, largely Great Black-backed. We quickly noticed several large whitish gulls mixed in, and set about trying to figure out what they were. I felt they were Glaucous Gull, due to size, forehead slope, and sneaky expression. Dan was leaning towards Iceland Gull, based on a smaller individual with a rounded, smaller head. It looks like we're both right! Try to figure out which is which - hours of fun for the whole family! Thanks Ken Thorpe for the help (and for the redpoll tips).