• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Search results

  1. T

    Costa Rican Taxonomy

    Very surprised they want to recognise Northwestern crow again. AFAIK, not identifiable by voice, appearance or genetics, only location !
  2. T

    Costa Rican Taxonomy

    Well established for butterflies of course
  3. T

    Costa Rican Taxonomy

    The standard way to assess this is playback experiments. Play the song of one to the other and assess the reaction. Has to be done carefully, of course
  4. T

    Costa Rican Taxonomy

    Taxonomy is subjective. It's even a bit subjective to the birds themselves because around 16% of birds (at least) hybridise. The "fuzzy edges" around a species are likely to be most fuzzy for young and still splitting taxa (e.g. Iberian green woodpecker with its wide hybrid zone with European...
  5. T

    Costa Rican Taxonomy

    Just scanned the BoW tropical kingbird entry. Wasn't obvious there was much differentiation between the populations. What's the evidence here?
  6. T

    Costa Rican Taxonomy

    Just own it. You're going have to go through every single item and explain. Might as well get started (and thanks for this interesting thread)
  7. T

    Costa Rican Taxonomy

    Goodness. Lots here I was unaware of...
  8. T

    Costa Rican Taxonomy

    Could you summarise/list ones and twos for those (like me) who aren't members?
Back
Top