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

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  1. B

    The Red nut bag phenomenon. (Siskins in the UK)

    Elizabeth, Siskins' predilection for red nut bags has been known for many years, but I've never seen any explanation for it. Jason
  2. B

    The Red nut bag phenomenon. (Siskins in the UK)

    Any theories as to why? I've always wondered. Jason
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