While I was in Atlanta, I read a New York Times story about birding apps for iPhones and the like. (Until I get another job, I can't afford an iPhone but I'm lusting after one.) The article says that developing an app that identifies birdsong is problematic because birds have regional "dialects."
That was a coincidence because I'd been listening to the breeding song of the cardinals in Atlanta and it was noticeably different from those in Miami, 700 miles to the south. The song in Miami has a higher pitch and is faster.
Has anyone else noticed the same thing with cardinals or other birds?
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