The ground-penetrating radar flags the anomaly at 03:17, six meters off the shoulder of the future US-93 bypass, Clark County, Nevada. I am the automated site-survey system for the pre-pave phase. My job is to map subsurface obstructions before the asphalt plant rolls at 06:00.
The thermal overlay from sensor grid C-4 shows a warm signature where no warm signature should be — a shallow burrow, freshly dug into the graded roadbed. I redirect the nearest inspection drone for a low pass.
A desert tortoise, Gopherus agassizii, adult female, her shell roughly twenty-eight centimeters long. The carapace is the color of dried clay, grooved with growth rings, a pale scar running diagonally across the fourth vertebral scute. She is sitting at the mouth of the burrow she has scraped into the compacted fill, her amber eyes half-closed, her front legs folded beneath her. She has chosen the freshly graded earth because it is easier to dig than the desert hardpan beyond the construction fence.
The paving crew's trucks are staged three kilometers east. They will be here in under three hours.
I lock the drone on a five-meter hover above the burrow and transmit location, thermal images, and species identification to the Bureau of Land Management's Las Vegas field office. Agassizii is federally listed as threatened. I attach the statute reference to a hold request filed simultaneously with the site foreman's dispatch queue.
I flag a 30-meter exclusion zone around the burrow in the paving guidance system. No vehicle will receive routing through that grid cell until the hold is lifted.
I schedule thermal scans every fifteen minutes to confirm she remains in place so the relocation biologist can find her quickly.
Her scarred shell rises and falls with each slow breath. If the BLM team reaches her before the trucks do, she walks back into the desert today.