It might seem like a kind gesture, but feeding bread to ducks, geese, and swans can have devastating and irreversible effects on their health. Experts and conservation groups across Ontario are warning the public that human food — especially bread and crackers — can lead to a severe deformity known as angel wing syndrome, leaving birds unable to fly, migrate, or escape predators.
The Windsor/Essex County Humane Society recently issued a reminder that feeding wild birds bread is harmful, despite being a common practice in parks. “Often, geese are fed bread or crackers by well-meaning people, but this is very harmful to them,” the organization said in a public post.
Angel wing syndrome occurs when the last joint of a bird’s wing twists outward, giving it a wispy, protruding appearance. “Just like our arm with a shoulder, elbow, and wrist, with angel wing, it would be like twisting your wrist in the wrong direction,” explained Laurel Ironside, treasurer of Trumpeter Swan Conservation Ontario. Once developed, the condition is extremely difficult to reverse unless detected at a very young age, and it often leaves birds permanently grounded.
The consequences are life-threatening. Birds with angel wing can’t migrate in winter or flee predators, often leading to early death. In 2024, two young trumpeter swans from Scarborough showing signs of the deformity were rescued and treated at Shades of Hope Wildlife Refuge in Pefferlaw. According to refuge founder Gail Lenters, dozens of trumpeter swans are treated each year for injuries and illnesses — some caused by angel wing, many others by lead poisoning.
The Toronto Field Naturalist group explains that bread is nutritionally equivalent to junk food for birds: high in carbohydrates and protein but lacking essential vitamins and minerals. Over time, this poor diet causes the wing deformity and can also block a bird’s crop, leading to starvation. Birds’ natural diets consist mainly of grasses, aquatic plants, and small aquatic invertebrates.
Municipalities are also taking action. The City of Barrie recently warned residents against feeding wild birds, noting that food scraps not only harm their health but also change their behaviour. Birds fed by humans lose their natural fear, become more aggressive, and may stay through the winter instead of migrating, increasing their risk of starvation and disease.
Experts agree: the most compassionate way to care for wild birds is to let them forage naturally. As angel wing cases rise, Ontario officials and conservationists are urging residents to keep bread and snacks out of parks — and keep wildlife wild.