Mute swan

The mute swan (Cygnus olor) belongs to the order Anseriformes and the family Anatidae. While often viewed as a decorative species, mute swans can function as agricultural pests, particularly when they target emerging winter crops situated in close proximity to large water bodies or wetlands.

These birds primarily damage winter wheat, barley, and oilseed rape during the early spring season. As they graze in groups, they consume the young shoots of these crops. The feeding activity is most intensive during the transition period when natural aquatic vegetation is not yet sufficient to sustain their nutritional needs.

The biology of the species involves gregarious behavior during migration and foraging. Because mute swans are relatively heavy birds, their presence on a field causes significant mechanical damage. Beyond direct consumption, they flatten and crush tender plants by walking across the rows, leading to severe stand reduction.

The type of damage is characterized by clean defoliation of seedlings down to the soil surface. This leads to patchy fields, forcing farmers to consider reseeding. The birds are highly persistent; if a flock identifies a reliable food source, they will return daily until the resource is exhausted or they are deterred.

Protection strategies focus on non-lethal deterrents. Farmers often utilize bio-acoustic systems, propane cannons, and visual repellents like predator decoys or reflective tapes. Proper field management, such as timely monitoring of swan activity near the farm perimeter during early spring, is crucial to prevent large-scale crop loss.