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Natural history

New growth on prickly pear

Heard a couple of Lucy’s Warblers, and saw a probable female Yellow Warbler in the shady part of the wash at the north end, where the warblers usually hang out at this time of year. Also saw a fleeting glimpse of black and yellow fly across as I was walking back down again, possibly a Hooded Oriole or a Townsend’s Warbler.


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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