MESA — Kelsey Shaw and her two children pick up large yellow and green caterpillars just off the Bush Highway near Saguaro Lake. The children have no hesitation handling these nearly 2- to 3-inch-long ...

As the school year comes to an end, Port Republic School teacher Jason Clarkson is preparing to set off on an expedition next month to study caterpillars and climate change in Tuscon, Ariz. Clarkson, ...