Where I live, there's not much rain, summer prevails. Can I use cardboard or not?
Md Ariful Islam
বিএসসি(সিএসই)
,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
No, build a nest box out of reliable and strong weather-proof materials so that if it does rain, the sparrows' home won't be ruined.
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