I call the Seagulls "invasive" because I do not believe that they are a Native population to the flats, at least in the large numbers they populate the flats now. These invaders are supported by Palmer and Wasilla fast food establishments, the human population in general and especially the Mat-su waste dump. I watched gulls drive waterfowl out of Potter Marsh over the last 10 years. That most rare and valued duck the Canvasback was starting to establish a foothold at Potter with a number of breeding pairs having numbers of chicks. No more! I have watched the gulls harass the Canvasbacks there and drive them away. I believe that some of these Canvasbacks have now went to the Hayflats and are trying to get established there are being attacked and harassed. Seagulls nest early at the Flats and are half-grown just when many ducklings are just being born. I believe that there is subsequent high mortality among the ducklings due to invasive gulls., both adult and first year cohorts of young gulls. I have watched this drama for 8 years on the flats during the spring and summer months and have witnessed dead ducklings and many attacks on adult and young waterfowl. It seems that the duck population is on the decline and may have been reduced by at least one quarter to a third.