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Natural history

Datura

The wash has been well scoured by rain, with evidence of serious flows, such as tumbled barrel cactus and prostrate brooms. The Hackberry bushes are covered with orange berries, and the floor is covered with desert marigolds, devil’s claws, and zinnias. Beautiful sighting of a Harris’s Hawk airing his wings on top of a saguaro cactus.

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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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