Actually, a significant portion of the Canada Goose population is becoming "resident", i.e. they do not migrate north/south. Some numbers being quoted are as high as 60% of the population. Due to lots of available safe habitat and food these birds are remaining in the vicinity of urban centers and creating big wildlife management challenges for airports. Additionally, due to the fact there is lots of food, few predators and they are not migrating, the populations are increasing and the average weight of the birds is increasing. The net result is that we are seeing more migratory bird strikes even in the winter months and they are causing more damage.