Sasquatch

 Bigfoot is an animal predicted to be in Red Dead Redemption.

Trivia

 * In the beginning of the game, many people bieleved of a Bigfoot in the game of Red Dead Redemption. It has been proven to be fake but Rockstar had released a screenshot of a unknown creature predicted to be Bigfoot.
 * It is also predicted it is extremely high in health due to the face that there may be possibly be like the Buffalo which DOESNT respawn.