A variety of exclusion methods can be used to exclude gulls from rooftops, window ledges, boat docks, stored forage areas, swimming pools, waste treatment ponds, small reservoirs, aquaculture facilities, landfills and outdoor dining areas.Several factors will influence the method chosen:
- the size of the area to be protected
- physical characteristics of the site’s shape (ie. window ledge, parapet, flat rooftop, etc.)
- cost
Monofilament or wire lines
Many studies indicate that stringing individual, parallel lines (monofilament or wire) over the site to be protected, at a height of 6-8’ is effective in preventing access to gulls. Crossing the lines in a grid configuration is also effective in excluding birds.- if using monofilament, 100# test line should be used
- if using steel wire, .8mm thickness is recommended
- herring and black-backed gulls - the preferred wire spacing is 40’
- ring-billed gulls - a wire spacing of 20’ is preferred