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AKICILJ
I'm trying to remember something that I think a prof told me lo these many years ago, but I can't remember enough specific words to do a Google search that produces the answer: ISTR that the prof mentioned, in class, a bird that lived around the globe, and that when started in one spot and travelled one way, the various species/subspecies were close enough to each other that they could mate with their neighbors, but that when you went back to the same spot and went the opposite way, the birds that occurred next to your starting species were different enough that they couldn't or didn't mate. If that makes sense.
The closest I can find so far is a reference to winter wrens, but they were only able to test that in 2007/2008, and I'm pretty sure that I was told this in a class in the late 1980s/early 1990s. But I might be mistaken and it's the winter wrens after all.
The closest I can find so far is a reference to winter wrens, but they were only able to test that in 2007/2008, and I'm pretty sure that I was told this in a class in the late 1980s/early 1990s. But I might be mistaken and it's the winter wrens after all.
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Srsly -- they nest in a ring around the arctic circle, returning to the same grounds they hatched from. Variations blend together as you circle the pole around their range, until the overlap no longer see each other as the same species for mating purposes. (They are, IIRC, actually interfirtile -- they just don't recognize each other as potential mates.)
---L.
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---L.
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all knowledge is contained in the internet, indeed.
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