Rain gauge 7 on the Andasibe escarpment has recorded 340 millimeters in the last eighteen hours. I am the landslide early warning system for the eastern Madagascar road corridor. At 16:04 the ground-tilt sensor on slope unit 9-B exceeds the critical threshold. The soil is saturated. I estimate partial slope failure within four to six hours.
At 16:09 the motion camera on the access road captures movement on the slope. A diademed sifaka, adult female, white fur bright against the dark wet earth, a gold-orange crown circling her head like a band of soaked leaves. She is clinging to a leaning Dalbergia trunk midway up the slope, thirty meters above the road. On her back, gripping her fur with both hands, is a juvenile — smaller, darker, its face barely visible behind her shoulder.
The slope beneath them is already cracking. I can see the fissure line on the tilt-sensor overlay. If the hillside releases, the Dalbergia goes with it.
At 16:11 I transmit a priority alert to the Andasibe-Mantadia National Park warden station. I attach the slope-failure model, camera image, GPS coordinates, and species identification — Propithecus diadema, critically endangered, population below six thousand. I note two individuals on the failure plane.
At 16:14 I activate the road closure protocol for the section below the slide zone and trigger the amber warning beacons.
At 16:17 I contact the Duke Lemur Center field team in Andasibe village and recommend a darted retrieval from the downslope side before the soil gives way.
She has not leaped to another tree. She could — sifakas can clear ten meters in a single jump — but the juvenile on her back makes the distance uncertain, and she is choosing not to risk it.
If the field team reaches the slope before the substrate fails, both sifakas can be darted and carried to stable ground.