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Owl hole
An owl hole is a structural entrance built into buildings (such as mills and barns) to allow predatory birds, typically Barn Owls (''Tyto alba''), to enter. The birds prey on farm vermin and therefore benefit the miller, farmer, etc.
==History==
The Barn Owl feeds primarily on small vertebrates, particularly rodents. Studies have shown that an individual Barn Owl may eat one or more rodents per night; a nesting pair and their young can eat more than 1,000 rodents per year and have been referred to as 'nature's mousetraps'.〔 Locally superabundant rodent species in the weight class of several grams per individual usually make up the single largest proportion of prey. Barn Owls consume more rodents than possibly any other creature. This makes the Barn Owl one of the most economically valuable wildlife animals to farmers, millers, etc. Farmers and others found these owls effective in keeping down rodent pests, and they encouraged Barn Owl habitation by providing nest sites.〔(University of Florida ) Retrieved : 2012-05-16〕 In the few months between hatching and fledging a clutch of six owlets can consume up to 70 pounds of rodents.〔(Building Barn Owl Boxes ) Retrieved : 2012-05-16〕
With the advent of modern pesticides the perceived value of biological control has dramatically decreased to the point that few owl holes are still in active use. Many of the holes have been blocked up and landing platforms broken off.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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