A couple of years ago Lake Erie was very very low which warmed the water up which meant a population explosion of some sort of muscles (tiger clams or something) which turns out to be a favourite food of swans. My mother lives in Port Colborne on Gravelly Bay (NW end of Lake Erie) and for a couple of weeks the tourists flocked to see the swans which were flocking to the Bay - I think there were about 3,000 or something. The more acceptable face of climate change, I guess.

sian