The Zubble-Wump was a green bird-like creature being hatched out of a Zubble-Wump egg near the end of the Wubbulous World episode "The Song of the Zubble-Wump."
Dr. Seuss Wiki
The Zubble-Wump was a green bird-like creature being hatched out of a Zubble-Wump egg near the end of the Wubbulous World episode "The Song of the Zubble-Wump."