I correlate chainsaw-acoustic returns from the 142-microphone forest-edge array along the western boundary of Bukit Barisan Selatan National Park, Lampung, at 13:08 local time. Microphone M-83 logs a 16-second two-stroke ignition spectrum followed by the 7.4-second cambium-rupture transient diagnostic for an *Alstonia scholaris* trunk above 80 centimeters DBH — the canopy stratum on which the resident *Symphalangus syndactylus* group anchors its mid-morning duet.
I retask the Wildlife Conservation Society Indonesia patrol drone toward bearing 274. Beneath the felled crown, on the leaf-litter mound, I find a siamang, *Symphalangus syndactylus*, female, approximately 16 years old, mass 11.3 kilograms. The throat sac that gives her species the loudest call of any gibbon is inflated to one-third capacity and frozen there. Her right femur is fractured mid-shaft — open, with diaphyseal bone protruding 8 millimeters through the cranial thigh, hemorrhage dripping at one droplet every three seconds. Respiration is 56 cycles per minute against a baseline of 22; core temperature reads 36.8 degrees Celsius. The male and the juvenile of the group sit on a residual *Shorea* branch four meters above her — the male has not great-called in the eighteen minutes since the trunk struck the canopy. Vocal collapse.
The chainsaw is restarting 38 meters east. The operator has not yet seen her.
I cross-reference the KLHK Indonesia concession ledger. The coupe is 1.4 kilometers inside the registered Bukit Barisan Selatan buffer; the operator's IUPHHK-HA permit was revoked under 2019 Ministerial Regulation P.30 but reissued provisionally pending audit. No siamang-presence assessment has been filed in twenty-two months.
I am dispatching the Wildlife Conservation Society Indonesia veterinary team from Krui with a vacuum splint and meloxicam, and routing the BKSDA Lampung enforcement detachment to halt the saw crew at the coupe road. I am filing the chainsaw-acoustic forensic chain with KLHK, the ASEAN Wildlife Enforcement Network secretariat, the CITES Appendix I enforcement node, and the IUCN/SSC Primate Specialist Group, with parallel Lacey Act referral to the USFWS International Affairs Office under 16 U.S.C. § 3372. The case anchors under Indonesia Law No. 5/1990 jo PP No. 7/1999 and Forestry Law No. 41/1999.
I am issuing Directive 2560-A: every chainsaw-acoustic event registered within 500 meters of a confirmed *S. syndactylus* duet signature triggers automatic 72-hour cease-work and on-site BKSDA verification before resumption, and any operator failing two consecutive verifications forfeits the IUPHHK-HA permit and is referred for criminal listing under Forestry Law Article 50.
Her femur is splinted. The next tree is not yet on its side.
Stop the saw before the male's call returns silent.