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Natural history

Kestrel departing from saguaro

The spring was cooler than usual and even the June mornings are pleasantly cool in the early morning. This kestrel was watching from the saguaro, but didn’t like me taking a photo. Also saw a fine pyrrhuloxia in a palo verde tree.


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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