On a recent hike in Arizona’s Sonoran Desert, I stumbled upon one of nature’s most remarkable dwellings. It wasn’t made by force of water, wind or sun. And it wasn’t made by any creature either – well, not quite. I’m talking about the Saguaro “Boot. " What in the world is the saguaro boot and what makes it the desert’s most versatile dwelling? The saguaro boot has an interesting story, one worth telling, and here it is.
The beautiful Gila Woodpecker (Melanerpes uropygialis) is native to the Sonoran desert and can be found anywhere the giant saguaro cacti are found. It builds its home in the saguaro cactus by drilling a hole in the side of the cactus and excavating a cavity for itself and its offspring. This cavity is usually a foot deep! When the woodpecker vacates this new home in approximately one year, other birds will then use it as their own.
Here’s the interesting part. In order to prevent water loss due to this new hole in its side, the cactus will form a callus over its exposed surfaces. This callus will remain inside the cactus as long as it lives and will act as a permanent waterproofing seal. This scab will also protect the cactus from other maladies caused by infection.
Once the saguaro cactus has lived out its life, and this can take 250 years, it will decay and disintegrate as all living matter does and it will leave behind this callus that once protected it. Because the Gila Woodpecker’s home started as a hole in the cactus and widened into a larger cavity, the callus when separated from the saguaro cactus looks very much like a boot. The boot, while caused by the woodpecker, is actually grown by the cactus as a defense mechanism.
Over its life time, the Gila Woodpecker’s home in the saguaro cactus will be the primary residence for dozens or even hundreds of birds such as the Cactus Wren, Kestrel or Elf Owl and when the cactus is gone, the boot will offer shelter to a variety of other wildlife such as mice, lizards, snakes, spiders and insects.
The next time you see a hole in the side of a saguaro cactus, think about all of the residents who will use the Gila Woodpecker’s nest as their home. Take a friend on a hike and look for the illusive saguaro boot. Nature is wondrous and its flora and fauna are remarkable. Get Outdoors!
Chuck Fitzgerald, The Outdoor Guy, has written a beginner’s guide to bird watching call “Learning to Bird. " Visit http://www.birdwatchingebook.com to see just how easy and how much fun Bird Watching really is. Chuck is the owner of Arizona based BackCountry Toys, an online store helping you to have fun in the great outdoors. To get maximum enjoyment out of your outdoor life, visit http://www.BackCountryToys.com where you’ll find great gear and the Tips & Tales e-newsletter, “FreshAir. " (800) 316-9055.