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Post by WildlifePaul on Apr 17, 2020 10:23:50 GMT
I don't think the standard concrete boxes you buy have really thick holes Matt, Its probably the same thickness as a standard bird box, The ones I have seen anyway. If you can make it thicker I'm sure it will be more appealing because it offers more protection.
I wonder if thats why my sparrows love my box I have for them, Before under the hole on instead there a "ledge" that is around 5cm / 6cm long before they drop down into the nest part of the box. That is the only difference with that box compared to a normal one, That is designed to offer extra protection because if a cat gets it paw in hole they can't reach into the nest part due to this ledge inside.
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