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

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  1. bitterntwisted

    Marsh or Willow Tit (Europe, determining)

    Clear-cut cheek divide and pale spot at bill base make it a Marsh Tit (depending on the relative abundance of Marsh and Willow at the location) Graham
  2. bitterntwisted

    Marsh or Willow Tit (Europe, determining)

    Try it this way, Jos. A pharmaceutical company devises a new test for a rare illness, which affects only around 6000 people worldwide. The test is very accurate - they say it's 99.999% accurate (i.e. it produces only 0.001% false positives) You take the test and are shocked to find that you...
  3. bitterntwisted

    Marsh or Willow Tit (Europe, determining)

    It's plain wrong, and should be removed from the new edition. Both use feeders and tables regularly. Graham