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

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  1. T

    Crossbills

    Statistics There was an interesting reference above to a recent paper on Tapaculos by Jorge Avendano and I by RoyN above: PDF on the journal's website: http://www.ornitologiacolombiana.org/oc6/doneganyavendano.pdf I've also looked into variation in Grallaricula antpittas and some other groups...
  2. T

    Crossbills

    Statistics error
  3. T

    Crossbills

    I have read all these papers. Let's look at the Condor "new species" description from last year. Diagnosis: "Very similar to other Red Crossbills in North America but larger (body mass and bill depth, but upper mandible relatively short) on average than other Red Crossbills currently found...
  4. T

    Crossbills

    There was a typo on one of the emails above which seems to have been propagated. For "finch" read "chickadee" or "tit". I suppose my point is, if voice is learned, there are no genetic differences and no morphological differences between populations, then how are humans deciding which...
  5. T

    Crossbills

    In relation to this point: "Kroodsma's research is also instrumental in demonstrating that tyrant-flycatchers and finches (among other birds) have very different methods of song development. Tyrant-flycatchers have innate songs, whereas finches learn their songs. In other words, this is an...
  6. T

    Crossbills

    A rant about crossbills There is some really interesting research going into these birds at the moment. Documenting the differentiation in vocal types is an important part of understanding more about them. However, I am a bit concerned at notes on this forum, and the recent description...
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