Canada Geese Moult Leads to Aggressive Encounters and Calls for Control Measures

During the July‑August moult season, Canada geese lose all their flight feathers at once, rendering them temporarily flightless. Expert Ryan Fisher of the Royal Saskatchewan Museum explained that this loss makes the birds more aggressive as adults protect their goslings and seek safety in larger flocks. He advises park visitors to give the birds a wide berth and avoid getting between adults and their young.

In British Columbia’s Vernon area, the concentration of flightless geese has sparked public health concerns. Their droppings, up to 1–2.5 kg per day per bird, foul beaches and lakes, fostering algae growth and raising E. coli risks for swimmers, especially children. Local residents have urged the City of Vernon to expand its goose‑control program, including egg addling and culling, to reduce the numbers and associated contamination.

Canada geese are protected under federal migratory bird legislation, which prohibits intentional harassment, though simple passage through parks is not prohibited.