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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
It depends on the size of the bird. If the body can fit through, it is big enough. A good size is about 2 1/2 inches; this way, the bird can get in, but predatory birds can't.
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