Demi the Cougar

 is a rare animal found in Red Dead Redemption. She can only be found in the Liars and Cheats DLC while playing in Free Roam on the Silent Stead hunting ground. She appears after all waves of cougars have been killed and is usually accompanied by 2-5 regular cougars.

Characteristics
Like her cousin Khan, Demi can take a large amount of damage, even from high powered weapons like the Semi-auto Shotgun or the Buffalo Rifle. It is advised to stock up on ammo before attempting the Silent Stead hunting grounds.

Trivia

 * The name Demi is most likely a reference to actress Demi Moore. This is because she is commonly referred to as a "cougar," which is a slang term for a woman, 40 years of age or older, who pursues younger men, typically more than eight years her junior
 * Demi uses the same model as Khan, suggesting that the two are related.