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Ultrasonic devices are static sound-emitting bird deterrents, which, in theory, will annoy birds to keep them away from enclosed or semi-enclosed areas. Ultrasonic scarers are not harmful to birds, however, there is debate around birds' ability to hear these frequencies at loud enough decibels.
Acoustic harassment and acoustic deterrents are technologies used to keep animals [1] and in some cases humans away from an area. Applications of the technology are used to keep marine mammals away from aquaculture facilities and to keep birds away from certain areas (for instance in the vicinity of airports and blueberry fields).
Bird control devices fall under two categories: deterrents and exclusions. [4] Deterrent devices, such as sonic units and bird spikes, discourage birds from landing or roosting in an area by presenting a physical obstacle or causing discomfort and annoyance for the target bird.
A bird control spike, also known as an anti-roosting spike, [1] pigeon spike, or roost modification, is a device consisting of long, needle-like rods used for bird control. Bird control spikes can be attached to building ledges, street lighting , and commercial signage to prevent wild or feral birds from perching or roosting.
Still earlier than this, however, is the mention of the Klappermühle in German writings from at least the 16th century, which could signify either a true mill [clarification needed] intentionally designed to scare birds away especially from fruit trees, or a smaller windmill-like device similar to the klopotec. [1]
The sound-producing rattle of rattlesnakes is an acoustic form of aposematism. [30] Sound production by the caterpillar of the Polyphemus moth, Antheraea polyphemus, may similarly be acoustic aposematism, connected to and preceded by chemical defences. [31] Similar acoustic defences exist in a range of Bombycoidea caterpillars. [32]
Davis and his birds visit the club multiple times per week throughout the year, sometimes working in the afternoon and evening. The key is consistency and letting the pigeons know the threat is real.
The sound of the whistle varies depending on the movement of the wings, acceleration of the pigeon, wind speed, wind direction and the positions of pigeons within the flock. [8] The effect of Mann and Petravicius' displays has been described as "unlike any other phenomenon", with Petravicius describing it as "rubbish on record but brilliant live".
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