Why Canada Geese Can't Fly: A Summer Moulting Mystery (2026)

Canada geese are a familiar sight in parks and along trails during the summer months, but their presence can be more than just a nuisance. As Ryan Fisher, curator of vertebrate zoology at the Royal Saskatchewan Museum, explains, this is a time of vulnerability for these birds. Canada geese are unique in that they lose all their flight feathers at once during their annual moulting period, which typically lasts from now until August. This means they cannot fly, making them easy targets for predators. To avoid attracting attention, they often form large flocks, a behavior that can be both fascinating and potentially dangerous for humans. When encountering these moulting geese, it's crucial to give them a wide berth and avoid getting between the adults and their goslings. While they may appear aggressive due to their inability to fly, it's important to remember that they are simply trying to protect their young. As the moulting season progresses, the geese will begin to prepare for migration. They will start eating more to build up their energy reserves, and by September, many will be heading south. This seasonal behavior highlights the importance of conservation efforts, as Canada geese were once endangered. Today, there are an estimated seven million Canada geese across North America, and their populations are stable or increasing in most regions. The story of the Canada goose is a testament to the success of conservation initiatives, and it serves as a reminder of the delicate balance between human activities and the natural world.

Why Canada Geese Can't Fly: A Summer Moulting Mystery (2026)
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