saguaros can live for up to 200 years...once one dies the inner structure is revealed...the skeleton of the plant consists of wooden rods known as ribs...even in this state the cactus can still serve as a home for spiders, caterpillars, lizards, snakes, mice, and a variety of birds

a close look here reveals a bird figure on the lower branch to the right...I missed that shot, but the keen-eyed Dan got it: http://www.pbase.com/dlgphoto/image/162437968