Mechanical deterrent

Mechanical deterrent (also known as stinger) is made up of a set of needles or spikes at variable heights of between 8 to 12 cm. affixed to a laminated base. It may be entirely of stainless steel , plastic or mix material (plastic base and stainless steel needles).

 The deterrence is given by the fact that the bird, in trying to alight on the protected area, injures itself (a bloody method), with consequent physical bother and it, therefore, flies or moves away.

The mechanic deterrent generally gives good results only if applied on parts that offer the least support (window sills, narrow cornices, electric or telephone cables, railings, gratings, etc.) that, if entirely occupied, does not allow the bird a way to go around the obstacle.

But if it is installed on a wider surface, such as eaves, roof apex or on the perimeter of an elevator tower, the bird, at the first try it will fly away but, recognizing that the cause of the pain is the mechanical deterrent, it will glide sideways to be able then to widen the needles and slip through them therefore neutralizing its efficacy.

For these reasons the mechanical deterrent is not recommended for the protection of wide structures such as roof, string courses, terraces, turrets, large balustrades.

 

 

Chemical deterrent:

Chemical deterrent consists of a substance (commonly called “repellent”) viscous in appearance and contained in tubes (silicone type). The effectiveness of this method is very limited, whether in surface terms (where it is possible to install it), or in terms of time resistance, being strongly conditioned by atmospheric conditions.

Its function is based on the fact that the bird, propped on the protected area, does not have a secure footing, and sensing it is slipping, takes flight and will alight elsewhere.

The problems encountered in the use of this method are of various origins: - Cleanliness: traces of the repellent will remain on the bird and therefore, once it moves to another surface, it will dirty it. - Structures: the chemical substance used penetrates in stones, marble, bricks, cement, granite, etc. and it is not possible to remove it, not even with the most advanced methods (such as sand blasting, etc.)

This factors render very limited the effectiveness of the method and difficult to apply. Moreover, keeping in mind that the amount of product diminishes in relation to the birds that alight on the protected area, it is impossible to calculate the time duration.

 

 

Ultrasonic Deterrent

The ultrasonic deterrent system, well known for excluding rats, mice, bats, dog, cats, etc. is totally useless on birds.

The latter, in fact, need very little time to get use to the troublesome whistle generated by this system, occupying thereafter the protected zone.