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I just read about Kermit's birthday. In reference to the part at the end about Kermit's Birthday being February 29th, it also says so on one of the Sesame Street Webpages, as well as in Sesame Street, Unpaved.
The back cover of The Muppet Show: Season 2 Disc 1 (at least the UK version) goes for May 9th 1955, and calls it "Kermit's official birthday". Daibhid C 20:10, 23 November 2007 (UTC)