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1988 - As contestants of the Guy Smiley game show, Bring That Thing.1988 - with Kermit, Old MacDonald, various farm animals and the Yip Yips, on a "News Flash" from Old MacDonald's Farm.1988 - The Yip Yips observe Luis and Maria in love.1987 - A Yip Yip contributes its voice to the Old MacDonald Cantata along with three Honkers, a Dinger, and Oscar's pet elephant Fluffy.Later in the show, the Yip Yips come back and leave a flower on the keyboard, which Luis discovers. Luis comes back to find that his computer has been changed by someone. 1986 - Luis walks away from his computer briefly, and the Yip Yips visit during that time and experiment with pressing buttons on the computer.1979 - Radio discovery by the Yip Yips.When Ernie yells to Bert asking what they should do about the visitors, Bert does not believe his story and replies, "Ask them if they want any oatmeal," to which they enthusiastically agree. Bert leaves the room and the Martians appear in exactly the way that Ernie had imagined. Bert then enters the room and informs Ernie that he was only in the kitchen making oatmeal. Ernie imagines that the Martians appeared in the middle of the night and asked Bert to join them in outer space. 1978 - Ernie wakes up and is unable to find Bert.1972 - Grandfather clock discovery by the Yip Yips.1972 - Phone discovery by the Yip Yips.Another common trait of the Yip Yips is that when frightened, they cover their face with the lower part of their jaw while making a "goom" noise. When they fail to 'correctly' interact with an object of Earth even after consulting their book, they are known to say "nope nope nope". As they come across common objects they are foreign to them, the Yip Yips consult a book they call "Earth book". The Yip Yips appear by materialising into a room, always saying "Yip-yip-yip-yip.
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This allows their entire bodies to be seen on camera, appearing to float in the air. The puppets have a very simple design, controlled entirely by two rods (one for the body and eyes, the other for the front of the mouth). Built by Caroly Wilcox, they are "Yip Yipped" by multiple Muppeteers including Jim Henson, Jerry Nelson, Richard Hunt, Martin P. with notable physical features such as squid-like tentacles, large eyes, and antennae. They are puppets depicting alien visitors from Mars. The Yip Yips (also known as the Martians or Aliens) are characters on the American educational children's television show Sesame Street. ( Learn how and when to remove this template message) Please discuss this issue on the article's talk page. Please read the layout guide and lead section guidelines to ensure the section will still be inclusive of all essential details. Please help by moving some material from it into the body of the article. This article's lead section may be too long for the length of the article.