Saguaro

This Saguaro is an amazingly well-grown specimen.  I photographed it in Catalina State Park, Tucson, Arizona.  Woodpeckers often make nest holes in these cacti, which are the trees of the desert, and other birds, including cactus wrens use then afterwards.  Saguaros can live for several hundred years, and estimates that I've seen of when they produce their first side-branch vary from 30 to 90 years.