For years on the show, Snuffleupagus was Big Bird's imaginary friend ... Herry Monster made his first appearance as a Muppet with light-blue fur, a furry nose, and no tongue.

With his bright red coat, big orange nose, and wide eyes, Elmo is arguably the most famous of the Sesame Street muppets–but he didn’t always have it this good. Elmo began as an "Anything ...