Research overview: defining the boundary between mainland and Sunda leopard cats

Recognizing two leopard cat species raises the practical question of where the boundary between them lies. This overview examines how the mainland leopard cat, Prionailurus bengalensis, and the Sunda leopard cat, Prionailurus javanensis, meet near the Isthmus of Kra and across the Sunda Shelf. It discusses the molecular evidence delimiting the two and the difficulty of drawing sharp lines where populations may grade or where sampling is sparse. The piece explains how the placement of intervening populations, such as those on the Malay Peninsula and certain islands, affects the mapped ranges of each species. It connects to the broader challenge in felid taxonomy of converting genetic discontinuities into geographic boundaries, especially in regions with complex island geography and limited sampling of small, secretive cats.