Which isolated island off the western coast of Sumatra preserves four endemic primate species found nowhere else, including the Kloss's gibbon (Bilou)?
Answer and explanation
Correct answer: D. Siberut Island
- Step 1: Siberut is the largest of the Mentawai Islands, designated a UNESCO Biosphere Reserve in 1981. Step 2. Its long geographical isolation produced distinct endemic primates: Kloss's gibbon (Hylobates klossii), pig-tailed langur, Mentawai macaque, and golden langur. Answer: Siberut Island. Why not the others: Nias has endemic avifauna but no endemic gibbons.
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