Mute swan

The Mute swan (Cygnus olor) is a large aquatic bird belonging to the family Anatidae and the order Anseriformes. It is distinguished by its white plumage and elegant appearance.

Adults possess a characteristic orange-red bill with a black base and a prominent black knob at the base of the upper mandible. They can weigh up to 15 kg and have a significant wingspan.

These birds are predominantly herbivorous, feeding on submerged vegetation, but they are known to graze on land when water-based food sources are limited or inaccessible.

The breeding season lasts from spring through early summer, during which they become highly territorial, often congregating in groups that can cause substantial local crop damage.

Mute swans are protected in many jurisdictions, which leads to increased population density and more frequent interactions with agricultural activities near waterways.

Mute swans primarily damage winter cereals such as wheat, barley, and oilseed rape. The birds graze on young green shoots, destroying the growing point of the crops.

Pastures and meadows situated near wetlands are particularly vulnerable to overgrazing, leading to reduced productivity and potential loss of the fodder crop.

Mechanical damage is a significant factor: the weight and webbed feet of the swans cause soil compaction, which hinders the development of young seedlings.

The removal of vegetation cover by feeding swans leaves the soil exposed to erosion and reduces the crop's ability to recover during the early growth stages.

High bird density on a specific plot can lead to excessive accumulation of droppings, creating nutrient imbalances that negatively impact plant health.

Clear signs of swan presence include large, webbed footprint patterns on moist soil, particularly at the edges of fields bordering ponds or lakes.

Visual evidence appears as patches of missing or heavily cropped vegetation, where plants have been clipped off near the ground level.

The presence of white feathers scattered along the field perimeter is a reliable indicator that a flock has spent time foraging or resting in the area.

Damage patterns usually start from the bank or edge and expand inward, creating distinct bare zones within the cultivated crop area.

Plant remains and droppings are often found at the site of feeding, leaving no doubt about the identity of the animals responsible for the damage.

Integrated bird management is essential. Using a variety of visual deterrents, such as scarecrows or reflecting tapes, can effectively deter swans from landing in fields.

Acoustic deterrents, including propane cannons or bird distress calls, are successful if used before the birds form a strong habit of visiting the site.

Physical exclusion measures, such as installing temporary fencing near water boundaries, provide the most secure protection for high-value young crops.

Strategic management of vegetation height and the planting of decoy plots can divert the birds away from primary production fields during peak grazing seasons.

• Monitor fields near waterways frequently
• Rotate deterrent methods to prevent habituation
• Establish buffer zones between water and fields
• Manage grazing pressure during early growth