Bigfoot

Bigfoot, also known as Sasquatch, is an ape-like creature that some people believe inhabits the forests of San Andreas in Grand Theft Auto V. Bigfoot is usually described as a large, hairy, bipedal humanoid. It was probably introduced due to the popular myth in Grand Theft Auto: San Andreas, which Rockstar Games confirmed to be fake.

Grand Theft Auto: San Andreas

 * Main Article: Bigfoot on GTA Myths Wiki

Rumors of Bigfoot being found in Back O' Beyond surfaced within a week of the game's release. Although no definitive proof of Bigfoot's existence was ever produced and Rockstar Games eventually confirmed that Bigfoot did not exist in the game, Bigfoot remained arguably the most popular myth of the GTA franchise. Possibly for this reason, Bigfoot was introduced in the next game taking place in San Andreas, GTA V.

Predator
The mission's objective is to hunt the O'Neil brothers in the woods of Cassidy Creek using a rifle with thermal scope. At the lower right corner you can see Bigfoot standing still. He will immediately disappear after he has been spotted. If Michael tries to shoot at it nothing happens.

The Last One
The mission is dedicated entirely to Bigfoot. Franklin meets a hunter who says that he has been on Sasquatch's tail for nine years. After searching the woods, the creature can be seen running. After a long chase, Bigfoot will be tired and will lay on the ground. He will repeat the phrase "I'm the last of my kind." Franklin concludes that the so-called Bigfoot is nothing more than a man in a suit.