The funny thing about Herbert Birdsfoot, is that he actually was a one year wonder. He was there for the Second Season only and was supposed to be a replacement for Kermit. Kermit didn't appear in any Second Season episodes. After a year of using Herbert, they found his charachter to be rather boring and dull, so they brought Kermit back at the start of the 3rd Season. Now even though Herber was only around that one season. There were several inserts from that second Season, that continued to be aired until Season 30. The very last time they aired an old insert with Herbert in it, was in the 30th Season when Ernie threw Bert a surprize party, and Bert sure was surprized because he had thought Ernie had done something wrong. Herbert was one of the guests at Bert's party. All he really did in that one was yell surprize. So there's the history of Herbert Birdsfoot.