Critical examination of the campaign to avoid bird collision
Critical examination of American Bird Conservancy's (ABC) campaign to avoid bird collision.
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Glass - a deadly trap for birds
Birds and glass - a problem with underestimated dimensions
Even when birds do not seem to show any injuries after colliding, every second individual dies later due to internal bleeding. Almost all groups of birds are affected, rare and threatened species among them.
Who would have thought that these protective glass panes would cause problems? However, many birds chose the seemingly direct route to the park behind the stadium and were killed.
Glass is a double safety hazard
|It reflects the surroundings: trees and the sky are reflected and indicate a suitable habitat.||It is transparent: the bird sees a bush behind the glass pane and does not perceive the obstacle.|
Preventive measures prior to construction
- Does it have to be transparent or highly reflecting glass?
- Is there an acute danger and how could it be prevented?
- Would a mobile system put up only when needed suffice (e.g. wind shelter)?
- Would a construction be an option where the panes are moved back between walls?
- Ribbed, corrugated, matted, sandblasted, etched, coloured, printed, halftone or stippled glass with minimal reflection
- Glass coated on both sides (e.g. for shop windows)
- Frosted glass, cathedral glass, glass bricks, translucent polycarbonate sheets
- Other non-transparent material
- Lattice windows
- Skylights instead of side windows
- Tilt glass panels instead of joining them at right angles
Protective measures after construction
- Only markings applied across the whole surface and contrasting with the surroundings are effective.
- 2 cm wide stripes of adhesive tape applied vertically at maximum 10 cm apart (or 1 cm wide stripes at 5 cm distance) are very effective, as well as grids etc.
- Use only high-quality adhesive tape or film.
- Apply markings on the outside whenever possible.
Simple, but effective
- Venetian blinds, roller blinds, curtains, cords, strips of foil
- Strip curtains, slats in conservatories
- Coloured decorations, children's drawings with finger or window colours
- Company signs, shop window decorations, decoration sprays
- Grilles, mosquito nets, large-meshed, coarse nets or perforated metal sheets.
Designing the surroundings
What to do when a bird collides?
Do you need advice?
Not suitable: Black bird silhouettes are often hardly visible and are not effective.
Only partly suitable: Coloured raptor silhouettes offer some protection. Several silhouettes should be applied per window.
For home use: Vertical strips of insulating tape and non-reflective adhesive tape (e.g. Scotch Magic 810) offer good protection but do not last very long.
For professional use: Scotchcal products by 3M are long-lasting and available in different colours.
Suggestion: Silhouettes and adhesive tape are applied to clean panes. To avoid bubbles moisten the glass and smooth the foil with a plastic scraper after applying. Old foil can be removed more easily if the glue is warmed with a hair dryer.