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The cockatiel before being mutant
When Dr. Animo attacked a supermarket in Washington DC with his Mutant Frog, he mutated this bird and a hamster. Its appearance and size change where it becomes a giant mutant cockatiel that Dr. Animo uses to kidnap Gwen, but she is later saved by Stinkfly.
When Dr. Animo is the museum, Gwen fights the mutant cockatiel. Once the Trans-modulator was destroyed, the mutant cockatiel returned to normal.