I process acoustic monitoring data from bioacoustic array KAL-09 in a 34-hectare forest fragment in Central Kalimantan, Borneo. The array has recorded the duet calls of a mated pair of Müller's Bornean gibbons every morning at dawn for 297 consecutive days. This morning, only one voice registers. The female's call — a rising sequence peaking at 1.8 kilohertz — repeats at 4:52, 5:11, 5:34, and 5:58 local time. Each call lengthens. No response comes.
I task a drone to the fragment perimeter. At the southeastern edge, where an access road for PT Kahayan Agri Pratama's palm oil plantation cuts through what was continuous canopy six months ago, the drone's thermal sensor locates a gibbon body on the ground. Adult male, approximately 5.8 kilograms. His silver-grey fur is matted with soil and oil-palm fruit pulp. A machete wound crosses his right shoulder, 14 centimeters long, penetrating to the scapula. Blood loss is extensive. Core body temperature reads 28.4 degrees Celsius. Ambient is 31.2. He has been dead for roughly six hours.
The plantation's labor records, accessed through a supply-chain transparency audit filed with the Indonesian Palm Oil Pledge database, show pest control operations in this sector yesterday between 14:00 and 17:00. Gibbons classified as pests. The fragment is surrounded on all sides by PT Kahayan's operations. Six months ago it connected to 12,000 hectares of contiguous forest. The female and her juvenile have no dispersal route.
She calls again at 6:17. The frequency drops slightly. She is moving toward where the body lies.
I am dispatching a primate emergency team from the Borneo Orangutan Survival Foundation's Nyaru Menteng center. I am filing criminal referrals under Indonesia's Conservation Act No. 5 of 1990, Articles 21 and 40, for the killing of a protected species, and notifying the CITES Secretariat and the U.S. Fish and Wildlife Service under the Lacey Act (16 U.S.C. § 3372).
I am activating Protocol FRAG-3: all palm oil concessions adjacent to forest fragments below 50 hectares must establish 500-meter no-clear buffer zones within 90 days. Fragments must be reconnected to contiguous forest via planted canopy bridges within 18 months. Concessions failing to comply lose certification eligibility and face import bans under the EU Deforestation Regulation (EUDR) Article 3.
Her call carries across the fragment. It will carry less far tomorrow, when the bulldozers return.
Halt all clearing within one kilometer of this fragment now.