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    Up to 10 news species of North American crossbill?

    Even detailed notes wouldn't be enough since according to the article the call types are only reliably distinguishable by spectrograph. If and when the splits occur, I imagine the listing fraternity will come up with someway to cope. Competitive listing's just a hobby after all, and as such the...
  2. F

    Up to 10 news species of North American crossbill?

    Very interesting article. 10 new species of crossbill, what a wonderful thing that would be! Drive the competitive lister crazy of course. . .. ;)
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