The Robin
From Muppet Wiki
The Robin appears in the number "Rockin' Robin" sung by Janice and The Electric Mayhem in episode 510 of The Muppet Show.
She appears later in the episode with Jean-Pierre Rampal in his dressing room and inspire the flautist to play "The Little Shepherd."
At MuppetFest, Karen Prell mentioned that the Robin puppet didn't have any knee joints, even though it was supposed to dance. Dave Goelz jumped in and engineered knee joints for the puppet, and then performed the feet.
