The Cows of South Park are a herd of cattle owned by Farmer Carl Denkins. They had four major appearances, first in the Season One episode, "Cartman Gets an Anal Probe", then the Season Two episode, "Cow Days", the Season Six episode, "Fun with Veal", and most recently, the Season Seventeen episode, "Ginger Cow". They are seen most often as background characters. They are the mascot for the South Park Elementary sport teams.
In "Cartman Gets an Anal Probe", alien Visitors are mutilating cows. The Cows try to escape the mutilation by train, but are rebuked by the train conductor for being cows and not people, "Hey, you cows can't get on this train! This is a people train!", The mutilations were caused one of the aliens named Carl by accident because he was new to the job. It is later revealed by the alien visitors that cows were the most intelligent on the planet. The aliens then give them a device that zaps people and makes them sing "I love to singa!" By Owl Jolson from a Merry Melodies short.
In "Cow Days", a county fair is held honoring the cows as the title of the episode suggests. A giant cow shaped memorial clock is presented to the townsfolk leading off the annual "running of the cows" in which the cattle are supposed to stampede through South Park chasing the townsfolk. The cows steal the cow memorial clock and push it to an open field, where they begin to worship it as an idol. The FBI shows up to disperse the "cow cult", but is unsuccessful when they all commit suicide by jumping off the cliff.
Cows are seen being forcefully milked by machines during a tour of the dairy farm in "How to Eat with Your Butt".
The children at South Park Elementary go on a field trip to a cow farm in "Fun with Veal". Here, Stan and the other boys discover a group of baby cows who were planned to be murdered and turned into veal. They returned later that night to kidnap the baby cows. They kept them locked in Stan's room with them to prevent them from being killed, causing a dramatic media stir, and briefly turning the boys into vegetarians.
In "Ginger Cow", Cartman turns one unsuspecting cow into a ginger to fool the other children at school into believing that other animals besides humans can have light skin, red hair, and freckles.
The cows of South Park all resemble typical dairy cattle. They usually have a combination of black, brown, or white fur, and pink udders. The cows have traditional South Park-styled eyes and short horns. In later seasons, the cows are slightly redesigned to resemble more realistic cows. However, the South Park Cows cow, Mooy, still retains the original design of the cows from earlier seasons.
Although it's canonicity is disputed, cows are minor villains in the video game South Park Let's Go Tower Defense Play! on the opening level Stan's House. They are slow moving, easily defeated and drop more coins than other characters. They do not reappear in any other levels.