The city pigeon belongs to the order Aves, the order Columbiformes, the family Columbidae, and the genus Columba.

With the development of cities in the past decades, they came to the city and successfully settled. Initially, they became an attraction in the squares in the centers of big cities. However, they quickly began to turn from a nuisance into a major problem.
The city pigeon (columba livia) is pejoratively called by many as the rat of the sky.
Its comparison with the mouse highlights its most unpleasant characteristics, such as its tendency towards pollution, the role it plays in the spread of various diseases and parasites, and its uncontrolled rate of reproduction.
Many pigeons are carriers of various pathogens.
They can transmit, mainly through their feces but also through simple contact, various diseases to humans and animals.
Salmonellosis, Cryptococcosis, Histoplasmosis, Psittacosis, Encephalitis, Pneumonia, Newcastle Disease.
Pigeon parasites include species of fleas, ticks, lice, etc.
The problems they create with their presence are primarily related to their large concentrations.
The dirt with which they fill their place of settlement creates a negative image (dirt, abandonment and stench).
The noise they make is particularly annoying for many.
Construction details of several buildings (recesses, protrusions, external piping, skylights, etc.) function as a place to attract and shelter pigeons, making the living and working conditions of their occupants difficult.
They cause damage to buildings and cars from their impurities, due to their highly corrosive, acidic action.
Window sills, balconies, roofs and cars are the most common "victims".
The lifespan of a structure can be greatly reduced if it becomes a gathering place for pigeons.
Their presence in ventilation systems is clearly more dangerous, as it is through them that infections can spread inside buildings.
High cleaning costs for private and public properties (e.g. benches, fountains, building facades, etc.).

Treatment

In many cities, feeding in public places next to monuments was banned.
Various systems and methods of repelling pigeons were developed.

Repulsion with spikes
It is a bird repellent system that consists of a plastic base on which thin, steel spikes are supported with their tips facing upwards.
Where used: On window sills, parapets, signs, beams, pipes, chimneys, projections, security cameras, air conditioners, lighting fixtures, etc.
Bird species: Pigeons or larger
Problem intensity: Moderate – High
Material: UV-stabilized plastic base and stainless steel spikes.
The spikes are available in pieces 30 – 35 cm long, and in widths that vary, depending on the width of the surface to be covered.
The pin system can cover any architectural detail, because the plastic base of the pins is flexible and can be broken into smaller pieces.
It's very discreet.
It is used in historical monuments because it is very discreet and easy to install.
The tips of the spikes are not pointed so they do not cause injury to pigeons or unsuspecting workers.
The system is installed with glue or screws.
Protection with nets

This is a bird repellent system that consists of a bird repellent net which is fixed to the surface, by placing a stainless steel wire rope frame around it.
The net is available in a wide variety of sizes, to cover small and large surfaces.
It can be cut exactly to the area we want, to adapt exactly to the surface we want to cover.
The mesh system can cover any architectural detail because it is flexible.
It is very discreet, since it is transparent, the light transmittance is 90%, at a temperature of 25°C, which makes it noticeable only from a distance of a few meters.
It is also used in historical monuments, because it is very discreet and easy to install.
It is resistant to both high and low temperatures (from -100°C to 135°C).
Under no circumstances does it injure the pigeons since as soon as they notice it, they move away without falling on it.
Where used: In skylights, windows, terraces, etc. and even for covering entire buildings, facades, etc.
Bird type: Pigeons or larger
Problem intensity: Moderate – High
Material: Reinforced and stabilized polyethylene, high density and strength with a neutral color (Transparent or black depending on the color of the surface we want to cover).

Repellent Gels

They promise long-lasting repulsion.
They are sticky or slippery.
They are not toxic.
They can be used on window sills, beams, air conditioners and many other outdoor surfaces to repel birds that are parking or nesting.
They don't harm the birds – they just make surfaces inhospitable.
Use according to instructions.
Audiovisual systems
They resemble natural enemies both visually and aurally.
Repellent with optical Gel – PROTECTA BIRD FREE

The latest method in Athens.
Birds are repelled through the optical illusion that there is a fire in the area where it has been applied.
ALL THE BIRDS ARE DRIVEN AWAY.
PROTECTA BIRD FREE can be used anywhere:
In urban, industrial and rural areas, inside and outside buildings.
Safely repels: Pigeons, sparrows, starlings, gulls, magpies, blackbirds, magpies, crows, etc.
It is not affected by difficult weather and climate conditions such as large temperature fluctuations and strong wind, rain and snow.
The oils it contains create a film and protect it from evaporation (it does not dry out) and from water (it does not dissolve).
It remains stable and effective for a long time.