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Desert acacia

Acacia smallii. Or possibly a White-thorn acacia. Growing at the edge of a back yard. The spines occur singly, unlike the paired spines of the White-thorn acacia, which has paired spines. At least, I think so, I’ll have to have another look.

Saw two Abert’s Towhees chasing each other through the trees, and a pair of Brown-headed Cowbirds, the female a dull brown, making a rapid chirping trill, and the male dark and glossy, making a strange liquid sound. Also, a couple of days ago, a Wilson’s Warbler and a Black-capped Gnatcatcher.

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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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