Saguaro in mountains west of Tucson, AZ. © 2008 Kenneth R. Sheide

Saguaro in Saguaro National Park, AZ. © 2008 Kenneth R. Sheide

Saguaro in Saguaro National Park, AZ. © 2008 Kenneth R. Sheide

Petroglyph at sunset in Saguaro National Park, AZ. © 2008 Kenneth R. Sheide

Sunset in Saguaro National Park, AZ. © 2008 Kenneth R. Sheide

Saguaro in sunset light, Saguaro National, Park, AZ. © 2008 Kenneth R. Sheide

Saguaro in desert near Tucson, AZ. © 2008 Kenneth R. Sheide

Petroglyph at Signal Hill, Saguaro National Park, AZ. © 2008 Kenneth R. Sheide

Spines on edge of saguaro near Tucson, AZ. © 2008 Kenneth R. Sheide

Saguaro near Tucson, AZ. © 2008 Kenneth R. Sheide

Saguaros backlit by sunset near Tucson, AZ. © 2008 Kenneth R. Sheide

Prickly pear cacti and ocotillo lit by sunset light near Tucson, AZ. © 2008 Kenneth R. Sheide