Duke (Kotasiyabale 1:1 Male, YM 18) is a male leopard of Yala National Park; “Duke” is a name used by Yala trackers and the Leopard Trails team. A large, well-built male first seen in late 2014 around Kotasiyabale, he appeared to control a large territory possibly in Block 2 or 3, as he rarely visited Block 1.