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Cows, also known as Moo Moos, are a species of animal who are responsible for the production of milk. They have made semi-recurring appearances throughout the Mario series, usually appearing with different roles depending on the game they are in.
The Super Mario Bros. Super Show!
"Mario and the Beanstalk"
In the The Super Mario Bros. Super Show! episode "Mario and the Beanstalk", Mario and Luigi had to get Gold Coins for the Mushroom Kingdom Orphanage, so they decided to sell Princess Toadstool's pet cow (the Royal Cow) to Dealin' Delbert. Delbert wanted to trade one of his many cows with Royal Cow, but the Mario Bros. wanted money. They instead traded Toadstool's Royal Cow for Garbanzo beans.
Mario Kart series
Mario Kart 64
Mario Kart: Double Dash!!
Mario Kart DS
Cows once again appear in the background of the retro track Moo Moo Farm.
Mario Kart Wii
Mario Kart Wii returns cows to the series and this time, cows serve as obstacles in a course called Moo Moo Meadows. A truck in the Moonview Highway course, also has a picture of a cow printed on it with the text "Moo Moo Dairy".
Mario Kart 7
Mario Kart 8 / Mario Kart 8 Deluxe
Cows return in Mario Kart 8 and Mario Kart 8 Deluxe with the return of the Moo Moo Meadows track, this time with cows of other colours, such as solid black or brown. Also, in Toad Harbor and the return of Toad's Turnpike there are advertising trucks and signs with cows on them.
Cows are briefly mentioned in Paper Mario, as in the Chapter 4 Interlude, when Peach goes up to the milk, it says "Milk, fresh from the Cow!".
Mario & Luigi: Partners in Time
Kamek mentioned a cow in Mario & Luigi: Partners in Time. On Yoshi's Island before his battle, Baby Bowser was eating too many Yoshi Cookies very fast and ended up choking. Whilst viewing the child choke, Kamek suggested he drink some milk from an "evil cow".
Mario Strikers Charged
Cows have also made various appearances in the WarioWare series. In the WarioWare: Touched! microgame Fresh Squeezed, the player has to milk from a cow. In WarioWare: Smooth Moves's microgame, Community Service, the player must clean a cow's backside. In the WarioWare: D.I.Y. microgame, Farm Hands, the player must again milk a cow.
Mario & Sonic at the London 2012 Olympic Games
Mario Party: Island Tour
Yoshi's Woolly World / Poochy & Yoshi's Woolly World
Nintendo Badge Arcade
Cows appear as badges in Nintendo Badge Arcade that the player may collect and decorate their Nintendo 3DS HOME Menu with. They are a part of the Mario Kart 8 set of badges.
Minecraft: Wii U Edition / Minecraft: Nintendo Switch Edition