Protecting buildings against feral pigeons |
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Authors: | Daniel Haag-Wackernagel Ila Geigenfeind |
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Institution: | (1) Department of Biomedicine, Institute of Anatomy, University of Basel, Pestalozzistrasse 20, 4056 Basel, Switzerland |
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Abstract: | Feral pigeons (Columba livia, Gmelin 1789) cause different problems for building owners when using structures for daytime perching, sleeping, and breeding.
Problems include fouling of building facades and pavements, transmission of allergens and pathogenic microorganisms, and infestations
with ectoparasites emanating from breeding sites. Owners are primarily interested in keeping away unwanted pigeons from their
property. Pest control companies offer different deterrent systems, of widely varying efficacy, for proofing buildings against
feral pigeons. A better solution is avoiding attractive structures during building design or subsequent alterations of existing
structures used by feral pigeons. With our study, we elaborate the relevant structural data to help to maintain a building
free of pigeons. We performed experiments with free ranging feral pigeons in a feral pigeon loft in the City of Basel, Switzerland.
The maximum outlet width a pigeon is not able to pass through is 4 cm; the respective outlet height is 5 cm and a pigeon-safe
square opening is not larger than 6 × 6 cm. The maximum ledge width a pigeon is not able to sit on is 4 cm. The pigeon-safe
angle of inclination for smooth construction materials (tinplate, glass, plastics) is 25°, for medium rough materials (wood,
plane concrete) 35°, and for rough materials (sandstone, rough concrete) at least 50°. Additionally, we studied the behavioral
strategies used by feral pigeons to surmount our experimental constructional restrictions, ledge width, and ledge inclinations.
Our data provide the essential data to prevent feral pigeons from using building structures. |
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Keywords: | Columba livia Behavior Building structures Deterrent systems Constructional restrictions |
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