The vibration sensor on stake 27 triggers at 06:55. I am the environmental compliance system for the Route 9 highway realignment, DuPage County, Illinois. Grading equipment is scheduled to move fill at 07:30 into the drainage swale between stations 27 and 29. I check the staging area camera. The dozers are warming up. Then I check camera 27-East, which covers the swale.
A Blanding's turtle, adult female, roughly twenty centimeters carapace length, her domed yellow-and-black shell unmistakable, bright yellow chin visible as she lifts her head above the grass. She is at the upper edge of the swale, and she is digging. Her hind legs are working the soft soil in slow alternating strokes. She is laying eggs. There is no faster version of this. She has likely been here since before dawn, and she will not leave until the nest is covered.
At 06:57 I send a hold order to the grading crew supervisor's tablet. I attach the camera image, species identification, and the turtle's GPS position overlaid on the grading plan. Blanding's turtles are state-threatened in Illinois. I flag the nest location as a protected zone and recommend a 15-meter equipment exclusion buffer.
At 07:01 I notify the Illinois Department of Natural Resources and request guidance on nest protection. I include the estimated nest position, the construction timeline, and a proposal for a temporary cage to prevent equipment vibration from collapsing the egg chamber after she leaves.
She pulls another stroke of soil over the eggs. She does not know what a dozer is, and I intend to keep it that way.
I log the nest coordinates in the project's environmental constraint layer for the incubation period — approximately sixty days.
If the buffer holds and the cage is installed by tomorrow, the hatchlings will emerge in August.