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A bird control spike, also known as an anti-roosting spike〔(【引用サイトリンク】title=Defender Anti-Roosting Pigeon Spikes - PCRC )〕 or roost modification, is a device consisting of long, needle-like rods used for bird control. They can be attached to building ledges, street lighting, and commercial signage to prevent wild or feral birds from perching or roosting. Birds can produce large quantities of unsightly and unhygienic feces,and some birds have very loud calls that can be inconvenient for nearby residents, especially at night. As a result, bird control spikes are used to deter these birds without causing them harm or killing them. ==Styles and usage== Bird control deterrent spikes are normally around long, and work by reducing the area available for birds to land on. This forces larger varieties of birds, such as seagulls, pigeons, and crows to land elsewhere. As the birds do not come into contact with the spikes, the birds get stabbed slightly and usually unharmed. As a result, the Royal Society for the Protection of Birds (RSPB) recommends bird control spikes for deterring pigeons from gardens.〔(【引用サイトリンク】title =Feral Pigeon Deterrents )〕 Described as "the most effective (type of) stand-alone bird deterrent",〔 bird control spikes can be placed along ledges, walls, on top of commercial signage, closed circuit television cameras and in rain gutters, in order to prevent birds from perching on the surfaces. Bird control spikes are most common in city centres and coastal areas, where feral birds are more common and more likely to come into conflict with humans.〔(【引用サイトリンク】title =Gulls and People ) 〕 In addition, killing or harming birds without a valid reason is illegal in some areas; for example the Wildlife and Countryside Act 1981 in the United Kingdom forbids killing wild birds that are not causing serious damage to property or posing a serious risk to human health, which puts pressure on authorities and landowners to find non-lethal bird control methods.〔(【引用サイトリンク】title =Gulls and the Law )〕 As well as being used to control wild birds, bird control spikes see limited use in preventing larger climbing animals such as squirrels, raccoons and snakes from crossing an area. Some bird control deterrent spikes are electrified, using the same principle as an electric fence to increase effectiveness, and the distress call of the shocked bird can frighten others in the area. However, such devices cause unnecessary harm to birds, and are therefore illegal in some areas, such as the United Kingdom. Sharp-tipped bird control spikes are illegal in much of the rest of the world,〔 and are unsuitable for areas which are regularly accessible for humans. As a result, some companies manufacture special blunted spikes for use where sharp spikes are dangerous or illegal. However, the blunt spikes are less effective at deterring birds, and cannot block climbing animals.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bird control spike」の詳細全文を読む スポンサード リンク
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