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09 December 2025 - Case studies
Pigeons are among the most common birds and have always been known to be potential vectors of diseases. In recent years there has been a real increase in the presence of these birds in urban centers.
Below we present a case study on the use of Bird Free, the innovative multisensory repellent, used to combat the presence of a pigeon colony inside a warehouse.
Unfortunately, man-made environments are increasingly favoring some animal species that find food availability and shelter in these settings. Among these, pigeons increasingly constitute a serious problem by indifferently colonizing the urban and industrial fabric of our cities. These birds, in addition to posing a threat to public health due to the pathologies they can transmit through their guano, cause the deterioration of the facades and architectural elements of historical monuments due to the corrosive action of their droppings.
Their presence, in addition to having consequences on public health, poses structural risks to infested establishments. Nests, in fact, can block chimney ducts, ventilation routes, damage roofs, clog drains, causing infiltration and leaks. In recent years, with the increased use of photovoltaic panels, pigeons have found a new space to colonize, ideal for nesting, located between the roof and the panel itself, compromising the efficiency and profitability of the systems.
To combat the presence of these weeds, Colkim markets Bird Free, an innovative repellent gel that acts directly on their senses, namely sight, smell and touch. Thanks to the pyranin present in the formulation, the pigeon perceives the gel as a sparkling fire. Peppermint oil, on the other hand, generates a feeling of aversion, while the viscous consistency discourages the animal from returning to the nest.
Unlike traditional physical barriers, Bird Free addresses the pigeon’s natural instincts, modifying its behavior and preventing it from returning to the infested area from the first application.
The first step taken by the exterminator together with the warehouse owner was to analyze the causes of the presence of pigeons and the type of use of the structure (day/night roost, nest). After these initial evaluations, it was decided to intervene with Bird Free, determining the positioning of the trays in each area (every 25 cm, 20 cm or 15 cm) depending on the level of infestation.
If food was present on the site, it would have been necessary to also treat the surfaces used by the pigeons as day perches, but in our case, since there was no edible material inside the structure, it was sufficient to intervene directly on the main habitats, namely nests and night perches, leaving aside the day perches.
The treatment was carried out between late November and early December 2023, where nests were identified on the cable racks and in the spaces behind the roller doors. Every nest and night roost was treated with Bird Free, making these habitats inhospitable to pigeons. With this simple intervention, the customer confirmed that all the pigeons residing inside the building left the warehouse in a short period of time.
At the beginning of April 2024, a treatment verification inspection was carried out inside the warehouse, at the end of which, no specimens were observed. It was therefore possible to state with certainty that none of the resident pigeons attempted to nest in other areas of the warehouse and that no new pigeons entered the building once the treatment was completed.
Overall, 70 packages, or 1,050 trays, were used to treat this 4,800 m2 warehouse with Bird Free. Once the treatment was completed, the customer was more than satisfied that he had eliminated a long-standing infestation present in the warehouse. Subsequently, he decided to assign the designated exterminator a second pigeon-infested site to apply Bird Free.