Which critically endangered freshwater dolphin sub-population, locally known as Pesut, inhabits the middle reaches of the Mahakam River in East Kalimantan?
Answer and explanation
Correct answer: C. Irrawaddy Dolphin (Orcaella brevirostris)
- Step 1: Pesut Mahakam is an isolated freshwater population of the Irrawaddy dolphin (Orcaella brevirostris) dwelling in the Mahakam river basin. Step 2. With fewer than 80 individuals remaining, it is critically endangered due to river vessel traffic, gillnets, and sedimentation. Answer: Irrawaddy Dolphin (Orcaella brevirostris). Why not the others: Humpback and spinner dolphins are strictly marine cetaceans.
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