Deadlands: Shadows in the West
The Catamount is a large wildcat that is nearly impossible to spot thanks to its chameleon-like fur. It often conceals itself in trees, sometimes hooking its rear claws onto a branch and swinging down on unsuspecting prey. In addition, it is an uncanny mimic, and often imitates human screams or even cries for help.
As intelligent as a cowpoke and twice as big, the Catamount is a fearsome abomination. it stalks hunters and often turns their own traps against them. Catamounts are found primarily in the major mountain ranges of the West: Cascades, Sierra Nevada, Wasatch, and Rockies.
The group encountered this creature in Vicksburg. Well out of its natural habitat.