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

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  1. Deb Burhinus

    Tern at East Chevington

    One of the ‘missing’ Skerries Arctic Terns is breeding in Ireland - it will be interesting to know whether any offspring will return to their natal area or the traditional colony site of its parents and in what cy - a good ringing study project...
  2. Deb Burhinus

    Tern at East Chevington

    Do you have a link to this please, Brian?
  3. Deb Burhinus

    Tern at East Chevington

    Hi Killian I agree that for a scientific paper, Voelker’s analysis seems rather chaotically structured and based on unclear parameters. I do note that he does assign age classes based on collection dates of specimens viv a vis the ‘known’ moult periods for Arctic Terns (but as you say does not...
  4. Deb Burhinus

    Tern at East Chevington

    ha! that makes sense (I did wonder after posting whether that was the case) Thank you for clarifying your thoughts on ageing, it’s much appreciated. As far as the inner primary moult in the post-breeding period, prior to winter migration, as I was reading one of the studies I linked to...
  5. Deb Burhinus

    Tern at East Chevington

    Hi Killian In your montage you age the OP Arctic Tern as a 2cy and not a 3cybecause of the ‘dark’ outer primaries (suggesting very worn outer primaries rather than ‘shadow/poor lighting in the image which I put it down to initially). I’m interested partuculary to know why you would use this in...
  6. Deb Burhinus

    Tern at East Chevington

    Thanks for posting the write up Brian. For more detailed (headier!) reading on molt/aging 2cy/3cy Arctic terns, this study on specimens indicates retrice molt could be helpful in separating first summer and second summer plumages...
  7. Deb Burhinus

    Tern at East Chevington

    Apologies for giving the wrong date reference. (link now added) I think we see different things in the image ;) - but thanks for taking time to read the article. another great article on Commic Terns here...
  8. Deb Burhinus

    Tern at East Chevington

    Do you have literature or ringing data on specifically 1st Summer Arctics or 1st Summer Common Terns in the UK during the breeding season? I would be interested to see the data for prevalence of either. (I did not include 2nd summers in this question as you did btw nor any sightings outside of...
  9. Deb Burhinus

    Tern at East Chevington

    First Summer (or 1st s Arctics) would be fairly unusual in UK (they tend to stay on their winter grounds for the first summer) also, the outer primaries don’t look dark to me so I would be interested how you (and others) are so confident in aging this bird? Terns are notoriously difficult to...
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