Muppet pigeons have made several minor appearances on Sesame Street.
Two pigeons appear singing back-up in a series of 'coo's in "Keep the Park Clean for the Pigeons."
A pigeon also made an appearance in the 1992-2003 Sesame Street closing credits, and the same pigeon is also seen in the 2007-2009 opening sequence.
A trio of pigeons appear in A Muppets Christmas: Letters to Santa. Their performers were Bill Barretta (the husband), Tyler Bunch (the wife), and Matt Vogel (the son). A pigeon lands on Beauregard's face while he's driving the train in Muppets Most Wanted.