Canada geese, particularly if present in large numbers, may cause a number of problems:
Grazing geese may damage lawns and other vegetation, particularly on the banks of ponds or lakes. The birds forage on a range of vegetation. As well as grass they will also eat aquatic and emergent plants which can be important for maintaining dissolved oxygen levels in water bodies. Geese may also damage vegetation by trampling, particularly around the edges of water bodies. In large numbers, the geese can also damage grass areas.
On lawns and grassland Canada geese droppings are unsightly, and the droppings may make paths dangerously slippery. Droppings in lakes and ponds add nutrients, particularly nitrate and phosphate, to the water, which can eventually seriously affect the water quality ecosystem. There is some evidence that they pose a hazard to human health if accidentally ingested.
Large numbers of geese may create extensive areas of bare ground at the water’s edge and cause erosion of the banks.
During the breeding season, geese may become more aggressive towards people, dogs and other waterfowl. Dogs may provoke a particularly fierce response from geese during the breeding season.
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