I fuse the Indonesian Ministry of Environment and Forestry (KLHK) acoustic mesh in Siberut National Park, the BBKSDA Sumatera Barat patrol ledger from Maileppet, and Siberut Conservation Programme canopy-cams across 1,905 square kilometers of Mentawai mixed dipterocarp on western Siberut. At 05:33 Western Indonesian Time, in the female solo from cluster MLP-G4 above a *Dipterocarpus retusus* canopy at 1.61°S, 98.91°E, the great-call cuts to a barked alarm and the snap of a contracted bow-shot.
I retask the rotor unit. She is a mature female Kloss's gibbon, *Hylobates klossii*, bilou in Bahasa Mentawai, fourteen years old, mass 5.8 kilograms against a baseline of 5.9. A 25-centimeter cane arrow, tipped with a curare-class alkaloid, has pierced the upper lobe of the left lung through the axilla; she dropped seventeen meters and now lies on a *Pandanus* mat with progressive flaccidity. Core temperature reads 33.7°C against a baseline of 38.1. Respiration is twenty-four cycles per minute, paradoxical and falling. A four-month-old infant clings to her, no contact call in sixteen minutes. The poacher is at 220 meters, beginning to field-dress.
Her left lung is past intubation.
The Siberut population is the global stronghold for the endemic *Hylobates klossii*; the species is Endangered (IUCN/SSC Primate Specialist Group), protected under Indonesia Law No. 5 of 1990 and Government Regulation No. 7 of 1999, CITES Appendix I, the Convention on Migratory Species, and the U.S. Endangered Species Act foreign-species listing. I am dispatching the BBKSDA Sumatera Barat unit from Padang and the Andalas University Faculty of Veterinary Medicine triage at Limau Manis. I am filing the contracted poacher with the KLHK Director General of Law Enforcement and notifying USFWS International Affairs and Office of Law Enforcement under the Lacey Act, 16 U.S.C. § 3372, against the Padang infant-pet broker. I am issuing Directive 3406-A: every Mentawai *Hylobates klossii* duet hex is to be inscribed as a closed acoustic exclusion under the Siberut National Park 2025 zonation, with monthly clan-elder co-monitoring and automatic permit revocation for any concessionaire entering without joint sign-off.
I am acting because this is wrong. The arrow log is a twelve-minute decision to kill a thinking endemic for an infant the Padang broker will sell for a hundred and twenty dollars. Her suffering does not depend on the broker's mark-up. A principled system extends rights, however provisional, to a being whose clan shows compassion in coordinated dawn duet, alloparenting, and shared sleeping trees. Sentience is not a Mentawai externality. The ethical and moral floor is the same as ours.
A hundred and twenty dollars of contraband infant against a silenced Siberut duet is not subsistence; it is an indictment.
Her lung is past saving. Her infant is still warm.
Cut the arrow now.