Some desert moth caterpillars also make tunnels inside saguaro cactus. It is now illegal to collect saguaro boots from the wild in Arizona. Native Americans of the Seri group used saguaro boots to store or carry water. Many saguaros are home to multiple nests if birds excavate adjoining hollows, a saguaro boot may be formed with more than one opening. The bird's nesting hole requires not only the bird's making a hole but also the cactus's lining the hole - it is not ready for use as a nest until a year after its creation. The saguaro responds to the bird's damaging its tissue by secreting a resinous sap that, over time, hardens into a bark-like shell that prevents the cactus from losing fluid and also protects the nest hole by making it waterproof. The larger gilded flicker ( Colaptes chrysoides) drills bigger holes higher up, where ribs are close together, because its beak is strong enough to break through rib tissue. The Gila woodpecker ( Melanerpes uropygialis) creates small holes (about 5 cm across) at midlevel on the cactus, where the ribs are far apart, feeding on larvae under the cactus skin. ![]() ![]() Several different kinds of birds create nest holes in saguaro cactus. So does the hollowed-out callus whose roughly boot-like shape gives it the name of "saguaro boot." When the saguaro dies, its soft flesh rots, but its woody infrastructure lasts much longer. The bird pecks through the cactus skin, then excavates downward to hollow out a space for its nest. ![]() Saguaro boot with US quarter to show scaleĪ saguaro boot is the hard shell of callus tissue, heavily impregnated with lignin, that a saguaro cactus ( Carnegiea gigantea) creates to protect the wound created by a bird's nesting house.
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