July is traditionally the start of monsoon season in Arizona; the time when tropical storms from Mexico drench the thirsty desert and one can hear a giant, collective sigh from the plants and animals.
This is also the tim

e the dung beetles, hereafter referred to as dungers, come alive.
The monsoons are magical, especially if you’re lucky enough to spend them in the mountains of southeastern Arizona.
Every day starts sunny and warm, and by mid-day, the clouds are building, until around 2pm when the skies unleash their load.
The storms bring the indescribable, unique smell of rain-soaked desert, amazing sunsets due to the cumulus clouds, brilliant rainbows, and incredible lightening displays.
My field site, just south of the main peaks of the Patagonia Mountains (photo 1) , is an expansive, high-elevation grassland called the San Rafael. Cattle still roam the range, and the grasslands are so vast and the vistas so beautiful that Hollywood westerns have been filmed here. The San Rafael (photo 2) is approximately 13 km from the border with Mexico, so my twice-daily trapping runs typically involve waving to Border Patrol as they drive pas
t in their white trucks with green logos looking for illegal immigrants and narcotics smugglers. If I’m near the road, the Border Patrol officers usually slow the truck, roll down the window, wave and say “hi,” and continue on their way. I suspect they have a policy not to harass people -- they never ask me what I’m doing. I must look suspicious, though, digging holes in the earth at 6am. I imagine I fall into the “low risk” group given the fact that I’m not Mexican and I’m not a 20-something white male.
This year the monsoons did not disappoint – they arrived in full force on July 3rd, and on the morning of July 4th, I caught my first dunger, my nocturnal species known to science as Dichotomius colonicus. I let my first individual go, something I do every year.
W
ith steady monsoon rains come more and more beetles, among other things. So far this year my pitfall traps have yielded a gopher snake (photo 3) (who spent one night in a trap and was gone by morning), 2 tarantulas (photo 4) that I kicked out of their new “homes”, 3 scorpions (feisty little tail-whippers), crickets, millipedes, and various other creepy crawly things. Checking traps is always very exciting. In fact, as Forrest Gump’s mama always said “life is like a pitfall trap; you never know what you’re gonna get."

So, what do these traps look like? Basically, shit is wrapped in a piece of square mesh fabric that is then tied into a ball with string. The ball is hung by a metal rod ov
er a funnel that leads to a plastic holding cup (photo 5). The shit attracts the marauding dungers (they are excellent fliers), they land near the trap, walk toward the bait, and slide down the funnel into the cup. The idea is that the dungers never touch the shit, so they aren’t covered in it. Makes it a lot more sanitary when experimentally testing them! The traps aren’t fool-proof, though. Every year a few traps get flooded, at least one trap gets crushed by a cow hoof, rodents sometimes eat the funnels, and many mammals come steal the shit for food, but all-in-all, the traps do a pretty good job of nabbing beetles.
I’ve been living about six miles from my study site in a one-room cabin. The cabin is tucked among giant sycamore trees at the foot of a canyon rockface. A wash runs within 30 feet of the wooden walls of the structure, and when the rains fall heavy from the sky, the wash floods wildly with water for several hours, and then dries again. The cabin was originally constructed by my friends, Susan and Lee, when they were building their retirement home about 300 yards away. Lee added a new bathroom onto the cabin this year, complete with a composting toilet. There is no electricity, so I cook using a Coleman propane stove and light the room with candles at night.
A pair of barn swallows built a nest just below the eave of the cabin, and they have been diligently incubating eggs and now brooding their chicks. The cabin also has a new resident, a skink – a type of lizard. I don’t know how he got in, but I found him hanging out on top of my suitcase about a week ago and invited him to share the place. He keeps the cricket and spider populations down, and I delight in the sound he makes when he crawls across the concrete footprint of the cabin, a scraping sort of sound, but really the sound is the epitome of the word “slithering.” He slithers. He’s a big fella -- about 10 inches from nose to tail -- and he spends a lot of his non-hunting time behind a cabinet. I usually see him once a day, and he’s a friendly enough roommate, but we don’t talk much. The whole experience of the cabin makes me feel like Thoreau on Walden Pond.
Aside from the wildlife li
ving in and on the cabin, many other critters abound. The bunny population is out of control, which leads to an incredible coyote population. I see coyotes daily, and every morning I hear them yelping in amongst the cattle on the San Rafael. The other day I stepped on the tail of a gopher snake that was hidden in the grass, and I even wrastled a 4-rattled diamondback (photo 6) and got some nice photos of it (okay, okay, so it was already dead). I’m still waiting to see my mountain lion, the mythical beast that supposedly occurs at all of my field sites, the one that haunts my dreams, but who continues to elude me.
In total, I spend about 4 hours outside setting and checking traps, usually starting at 5:30am with the last check at 7pm. It gets dark at 8pm here on the 32nd parallel, so I envy all you high latitude folks and your long summer days! The days get even shorter when I’m in Ecuador. The equator has a 12 light / 12 dark cycle year round. Aside from trapping, the rest of my days in Arizona are spent experimentally testing dungers at the home of a couple, Jerry and Ann, who are currently out of town. The other day I found a Clark's Spiny Lizard trapped in their sink. I don't know how she got in the house, but I rescued her from the sink and released her outside after a ph
oto shoot (photo 7 and 8).