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

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  1. J

    The "Heard-only" List

    Since you need to include heard only birds on complete checklists submitted to online databases (such as eBird), I relaxed my previous policy of ticking only birds I see (except for nocturnal birds and rails). That has made the "heard only" category much less frustrating for me. But even so...
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