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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. YuShan

    Blue tits

    This can vary a bit, but I have 3 datapoints from my own Blue Tit nests in 2012, 2014 and 2016. The first egg was produced on resp 27/4, 4/4 and 20/4 in those years. The nest building itself sometimes starts weeks before the first egg, but sometimes just a few days before.