Roberto the Bobcat

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

Characteristics
Roberto can take a large amount of damage, even from high powered weapons like the Semi-auto Shotgun or the Buffalo Rifle, coupled with the vast number of bobcats attacking you makes Roberto one of the toughest kills of all the legendary animals. It is advised to bring a friend and stock up on ammo before attempting the Roca de Madera hunting grounds.

Trivia

 * The name Roberto is a play on the word "bobcat". Bob is a common nick-name for Robert, who's spanish equivalent would be Roberto.