Migrant Pollinators In My Backyard.

In support of National Pollinator Week, I’ve decided to showcase a pair of very welcome summer visitors to Southern Arizona, the White Winged Dove (Zenaida asiatica) and the Lesser Long-Nosed Bat (Leptonycteris yerbabuenae). These species have several things in common: they are super-pollinators, they migrate between southern Arizona and Mexico and they are both flying around in abundance in my neighborhood.

Although I have lived in the Sonoran desert for many years, I have to admit that I paid very little attention to the doves around me. I had heard their calls (they are hard to miss), but I attributed most of that to Mourning Doves without giving it much thought. All that changed a little over a month ago when I opened my bedroom curtain and came face-to-face with a bird sitting on a nest. It was so close to my window that I could have reached out and touched it. In order not to disturb it, I quickly and quietly closed the curtain. But, not before surreptitiously taking a photo. I showed the picture to a co-worker who excitedly said. “That’s a White Winged Dove! They are so cool!” I

White Winged Dove Adult & Juvenile

wondered why and thus began my new-found fascination with this bird.

White Winged Doves appear in southern Arizona in late spring to begin their breeding season here. What makes them special is that they migrate at this time to correspond with the reproductive cycle of the iconic Saguaro cactus (Carnegeia gigantea). Saguaros begin flowering from late April until mid-June; fruiting and ripening take place in June and July. As soon as they get to town, White Winged Doves start visiting the saguaros. They hop from one cactus to another sipping nectar and picking at seeds until the fruit comes in and the feasting begins. It is this flitting to and fro that makes them exceptional pollinators as they fly with pollen all over them. The doves are also adept at dispersing seeds; they scatter them everywhere they go. Here is a video of them in action.

The White Winged Dove and the saguaro are a perfect example of Mutualism in nature. This is when two species depend on and benefit from each other. The doves rely nearly exclusively on the saguaro for water and nutrients and the cactus needs the birds to spread its seeds and pollen.


Lesser Long-nosed Bats travel at least 1,000 miles north from Mexico to join us here in southern Arizona for pretty much the same reasons as the dove: to have babies and take advantage of the cactus buffet. In response to the presence of these pollinators, the saguaros have generously adapted to provide for both day and night feeders. Not only do their flowers bloom at night and stay open until the afternoon of the following day, nectar is produced in the night and in the morning. There is clearly enough for everyone!

Lesser Long-nosed Bat

Saguaro cacti are not the only form of succulent on the menu for Lesser Long-nosed Bats. They also feed on various types of agave. In fact, those people who love tequila (okay, maybe not the morning after) owe a debt of gratitude to these bats. Simply put, without bats pollinating agave in the natural manner, there would be no tequila. As the demand for more, and higher quality, tequila has increased the attention paid to these creatures has also increased. Once on the endangered list, these little guys have made a comeback in part due to those growers preserving safe migratory pathways for them. Nothing has proven to be as successful in getting a good crop as the old bat standby. Rarely does increased human demands bring back a species from the brink, but this seems to be the case here. Here is an interesting video with more on this.

Dove Love

I spent weeks peeking at the bird family in my bedroom tree; it was as if I was in on a secret world. I learned that both parents take turns sitting on the nest and, although their markings are essentially the same, I came to recognize each individual. They laid two eggs, but only one survived. That baby was remarkably strong and beautiful and gifted (do I sound like a proud relative?) and was up and out in no time. Now all that is left in their spindly little nest is the left-behind unhatched egg. It seems sad now. White Winged Doves are monogamous, at least through a mating season, and sometimes reuse a nest, so I take a look everyday hoping they’ve come back. I wish I had a picture to share, but I was worried about disrupting them, so the only pictures I have are through screen and glass and the details are hard to see. However, this blog has some pictures that show just what I was seeing. If you like birds in general or just want to see some truly amazing bird pictures, check out these 2018 Audubon Society Award Winners.

Submitted by Pam

Famous Faces of the Desert – The Saguaro

A Saguaro With Many Arms

Several years ago, I traveled to Budapest, Hungary with a friend. While we were there, some locals strongly recommended a particular bar. It was in the basement of a stately building in an old and beautiful part of the city alongside the Danube River. We went down the stairs with great expectation, opened the door and were hit with a cacophony of bright colors and cheesy images. There were saguaros, scorpions, rattlesnakes, tarantulas and sombreros. Our friends had recommended this spot because, knowing we were from Arizona, they thought we’d feel at home. We did not have the heart to tell them that the level of kitsch was almost painful to us Arizonans, so we lied and told them it was fabulous. We had a wonderful time with lovely people and, as the hours passed, the décor became less and less noticeable.

This event has always stood out in my mind as a true example of how the image of the desert southwest has been made almost cartoonish over time. In reality, we live in a complex ecosystem with deep layers of subtlety that is far more interesting than the stereotypes. Our environment may seem rugged, but it is extremely delicate and needs careful caretaking. The more you know, the more you appreciate it. All the ubiquitous symbols of the desert that were on display in that bar have incredibly interesting sides to them that are not well known.

The Saguaro cactus (Carnegia gigantea) is the perfect example of a misunderstood icon. Most people connect it immediately to the American West and even more to the Wild West. However, saguaros are only found in the Sonoran Desert, which includes southern Arizona, southeastern California, Baja California and the Mexican state of Sonora. Tucson is the epicenter of saguaro habitat; we even have two National Parks dedicated to them that book-end our city.

Saguaro In Bloom

Saguaros are very slow-growing (at 10 years it may only be 1-1½ inches tall), but can live to be 150-200 years old. They don’t even flower until they are around 70 years of age, at which time they are about 6½ feet tall. Their famous arms finally begin to appear when the cactus is 95-100 years old (when they will be between 15-16 ft tall). So, the famous shape of a multi-armed saguaro depicts an old desert soul that has been around far longer than the humans it shares a habitat with.

As with other desert dwellers, the saguaro thrives in the desert due to its ability to maximize available water. They store water when it is available and use it as needed. When full of water, a full-grown saguaro can weigh as much as 3200-4800 pounds. But saguaros don’t only care for themselves; they support multiple species within their thorns and around their roots. Brenda Z. Guiberson wrote a fabulous children’s book (with also-fabulous illustrations by Megan Lloyd) about the multi-tasking saguaro called Cactus Hotel. It is great fun for adults and kids and has long been a favorite in my family.

Crested vs. Uncrested

As interesting as saguaros are, their mutant relations, known as Crested (or Cristate) Saguaros, are even more fascinating. These rare cacti grow outward and form fan shapes at their tops instead of the normal circular pattern of a saguaro. The cause of this mutation is still a mystery; theories include lightning strikes, gene mutations and frost damage. The interest in and love for these unique cacti have even sparked the Crested Saguaro Society, who are dedicated to “these beautiful mutants”.

Yep! Those Are Cell Towers.

Saguaros are incredibly hardy plants; they are not prone to disease and have adapted to thrive in one of the most extreme environments in North America. Additionally, although they are only found in a limited range geographically and grow incredibly slowly, they are not endangered. The greatest danger to saguaros, like most of the species on Earth, is humans. Unchecked development, over-popularization of the species and the introduction of non-native species all threaten our saguaros. Thankfully, they are strictly protected by law in Arizona and it is illegal to own, remove or transport the protected plants without proper permits. Likewise, harming a saguaro in any way carries strict penalties.

Southern Arizona saguaros are seen as a natural treasure by most of us who live here. Their limitless variations and enduring beauty are a source of endless marvel. We like them so much that we even have cell towers shaped like saguaros.

Submitted by Pam