The Clever Bird is part of Mr. Dizzy's story. He doesn't make any other appearances.
In Mr. Dizzy's earlier (1976-1990) publications, the bird was drawn light brown with glasses and a cigar. It also perched on a branch It was changed in 1990 for reasons. Maybe it was because it encouraged kids to smoke in order to become clever. Now you see the clever bird maroon with a collage hat walking. It is also carried a book. The only thing that stayed the same was the glasses. The bird never ditched them. They might have only stayed just so that he could look clever.