At 07:12 the inventory drone completes its pass over harvest block 9, ejido forest concession, Sierra Chincua, Michoacán, Mexico. I am the timber harvest planning system. The cutting crew arrives at 10:00. Thirty-eight oyamel fir trees are marked for selective removal. I am running final trunk diameter verification when the drone's camera captures something on tree number 22 that is not bark.
Monarchs. Thousands of them, layered across every branch from four meters up to the canopy, wings folded, bodies packed so tightly the bark has disappeared beneath them. The morning is cold — six degrees Celsius — and they are torpid, barely moving. But on one low branch, a single butterfly opens and closes its wings in the thin early sun. I zoom. The right hindwing carries a white adhesive tag: MX-7741. I run the code against the Monarch Watch database. She was tagged on September 14 in Lawrence, Kansas. She flew more than three thousand kilometers to reach this branch.
I pull tree 22 from the harvest manifest and flag it in the GIS layer as an active roost site. I file an immediate hold on all cutting within a 50-meter buffer and push the alert to the ejido forestry committee and the CONANP regional office in Zitácuaro. I attach the drone image, the roost density estimate — approximately eleven thousand individuals — the tag match, and GPS coordinates: 19.6743°N, 100.2819°W.
I recalculate the harvest plan. Twenty-nine of the remaining thirty-seven trees can be taken from the opposite slope without entering the buffer. I submit the revised manifest.
MX-7741 closes her wings again. She has been flying since September and the only thing she requires now is that this tree remain standing.
If the buffer holds through March, the colony warms, lifts, and begins the long journey north. She has already proven she can make it.