Research overview: the split of mainland and Sunda clouded leopards

One of the clearest recent felid species splits separated the clouded leopard into two species. This overview explains how parallel molecular and morphological studies in 2006 revealed that clouded leopards from the Sunda islands of Borneo and Sumatra are deeply distinct from those on the Asian mainland, leading to recognition of the mainland Neofelis nebulosa and the Sunda Neofelis diardi. It discusses the estimated divergence of over a million years, likely driven by sea-level changes and volcanic events isolating island populations, and the concordant differences in coat pattern and skull morphology. The piece highlights why this case is celebrated as a textbook example of integrative taxonomy and how the split reshaped conservation, doubling the number of clouded leopard species requiring protection.