They are the only alien muppets that arrive on Sesame Street.
They are "yip-yipped" by multiple muppeteers like Jim Henson, Frank Oz and Martin P. Robinson.
... there are 97.9 males. The median income for a household in the town is $67,891, and the median income for a family is $80,748. Males have a median income of $41,917 versus ...