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Natural history

Cactus Wren declares Spring

Last night’s rain released the earthy and herbal aromas of the desert. This Cactus Wren was in full song. In addition to the usual engine-starting sound, he had a low growl, a back-of-the-throat grunt, and a rising sound like a cork twisting out of a bottle. Also saw a Mocking Bird, making a single loud high chirp.

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About Bill McCallum

I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.

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