As already mentioned, I added a small roof to avoid sun directly hitting the nesting box. I read a very interesting paper about the temperature which hatchlings can cope with as a function of age (3, 6,,...days old) and of number (3, 6, ... hatchlings). To avoid the temperature rising too much (the sun shines onto the nesting box between 12:30 and 16:15 pm. ca.), I constructed the roof and mounted it in what was a race against time or rather against the weather. I was totally nackered but happy when finally last night I could admire my work.
Some people were concerned that the birds would not like me moving around the box...well mother bird was sitting in the nesting box whilst I was working outside...
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