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Chicken eyeglasses, also known as chickens specs, chicken goggles, generically as pick guards and under other names, were small eyeglasses made for chickens intended to prevent feather pecking and cannibalism. They differ from blinders as they allowed the bird to see forward whereas blinders do not. One variety used rose-colored lenses as the coloring was thought to prevent a chicken wearing them from recognizing blood on other chickens which may increase the tendency for abnormal injurious behavior. They were mass-produced and sold throughout the United States as early as the beginning of the 20th century.〔(【引用サイトリンク】title=Lee's Summit Historical Society Museum Glasses for Chickens Unity Village )〕 ==Description and purpose== Chicken eyeglasses were often made from celluloid or aluminum and typically consisted of "two oval panels that fit over the upper beak of the chicken. A pin is put through the nostril to-hold the oval pieces in place."〔 Different designs were produced that attached to the chicken's head in different ways. Some were held in place by a strap,〔 some by small hooks into the nares (nostrils) and some by piercing the bone septum between the nostrils with a cotter pin.〔(【引用サイトリンク】title=Company History )〕 Due to the piercing of tissue, this last type of design is illegal in some countries. Some versions of the devices had lenses that were semi- or fully transparent whereas others were tinted, often red- or rose-colored. Other designs were blinders which are opaque and completely prevent forward vision.〔 The intended purposes of chicken eyeglasses were to prevent aggressive pecking, cannibalism and feather pecking. Chicken eyeglasses are an alternative to beak trimming, which is the removal of approximately one-third of the beak by a cold or heated blade, or an infrared beam, usually when chicks are 1-d old. This is often effective in reducing pecking injuries, but causes pain and has significant effects on chicken welfare. 〔 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「Chicken eyeglasses」の詳細全文を読む スポンサード リンク
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