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Good morning all,So for the first time, now my feeders are up and thriving, I’m going to put nest boxes up & am planning to make them this weekend using plans from rspb website, however I have a question regarding hole size...So I read most advise a 25mm hole size for say blue tits, but then a slightly larger size of 28mm for house sparrows; both of which species we have flying around.. my question is does such a small difference in hole size really matter? Essentially i have looked and only have a 28mm hole cutter, if I was to just put two boxes up with 28mm is there a chance the blue tits may still use one or do they really know the difference between the two sizes?Hope this isn’t a silly question aha but wanted to be sure Many thanks.
Tigger2803 said:I have a bird box and I have noticed a blue tit trying to widen the hole
It is normal for blue tits to tap at the entrance. If you have put up a suitable nest box, with entrance approx 25mm, it is best not to make alterations. Making a hole bigger will increase the likelihood of larger species using the box.