Parrot Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Parrot Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Parrot Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Parrot Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Parrot Dragon + Bolt Penguin → Twin-headed Thunder Dragon

Parrot Dragon + The Immortal of Thunder → Twin-headed Thunder Dragon

Parrot Dragon + Electric Snake → Twin-headed Thunder Dragon

Parrot Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Parrot Dragon + Electric Lizard → Twin-headed Thunder Dragon

Harpie's Pet Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Harpie's Pet Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Harpie's Pet Dragon + Tripwire Beast → Twin-headed Thunder Dragon