Bird dialects

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?

Visiting my mother-in-law in Atlanta ...

My MIL lives in Buckhead, which, if you know Atlanta, is an area of grand homes and splendid gardens.

I've missed the dogwoods, but the azaleas are at their best, and I'm told that it's the "best best" for years.

My MIL is elderly, frail, and has a list of ailments as long as your arm. Each weekday is about trips to this clinic followed by appointments with that doctor. It's no vacation.

Whenever I can, I escape to the garden and its magnificent oaks, magnolias and tulip maples. I look up at these towering trees, breathe in their spirit and feel my own blood pressure sink. To paraphrase the King James version of Psalm 121, "I lift up mine eyes to the trees ..." The sun is warm and the flowers are glorious. It only takes a few minutes to feel restored.