The Yip-Yips are the Martians in Sesame Street who appear, disappear, live in a spaceship with flashing lights and go "yip-yip yip-yip". Two of them, Bob & Joe Martian are investigating our planet, and in their observations of Earth they've come to the conclusion that our planet is run by vacuum cleaners and microwaves. The other three are the Yip-Yip family with their very cute baby Yip-Yip!
The Yip Yips first appeared in Sesame Street show #398 in Season III (1971-1972). They are voiced by Jerry Nelson and Marty P. Robinson.
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