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Duck-billed buntingi

Scientific name: Adrianichthys kruyti

Range: Lake Poso, Sulawesi, Indonesia

When last seen: 1983

Suspected reason for disappearance: Local fishermen believe its decline it is related to the eruption of the nearby Colo Volcano in 1983. Invasive species have likely also played a part, and introduced diseases and parasites are also possible explanations. Overfishing has also likely caused numbers to plummet.

IUCN conservation status: Critically Endangered

Facts: N/A

Size: Grows up to 16 cm, though usually closer to 11cm.