From Muppet Wiki

The Kenner Gooney Bird was the mascot of The Kenner Toys company from 1962 to 1974. It appeared on most Kenner products on a small postage-stamp sized square surrounded by the company logo (It's Kenner- It's Fun!) The Gooney Bird was a small, squat yellow bird with orange head and tail feathers, beak, and feet. He had a strangely sardonic smile as well as a bugeyed stare that seemed to look directly at the viewer.

He was used in many Kenner Trade ads with the logo "This bird means business." and appeared in animated segments of many of the TV commercials- usually doing some bizarre stunt like increasing his height or removing his head from his body while chanting the company slogan. In 1968, Jim Henson produced a commercial with a puppet version of the character, using a bird puppet which would later be refurbished as Little Bird for the first several seasons of Sesame Street.

The Gooney Bird continued to be used- a "bendy" type doll was produced,as well as appearing on GIVE-A-SHOW projector slides. However, Kenner began to take a more "action" oriented theme to its toys and the Bird was slowly phased out by 1974. The bird made one last hurrah in 2000 when Hasbro completely took over Kenner; special goodbye caps and watches with the classic bird logo were produced and given as thank-yous to employees.