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Natural history

Flycatcher in mesquite   

Usual problem of determing whether this is a Brown-crested or a Dusky Flycatcher. I think the former based on the call. Saw a very interesting drooping pencil cholla, as if it had been bitten but not killed by frost.

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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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