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The Thunderbird is a large, avian creature native to North America, and most commonly found in Arizona in the southwestern United States. A close relative of the Phoenix, the Thunderbird can create storms as it flies and is highly sensitive to danger. A house at Ilvermorny School of Witchcraft and Wizardry is named after this creature.
Newt Scamander found and rescued Frank from illegal trafficking in Egypt: while one of his legs bore the wounds of being chained, he was grateful of Newt and the latter went to the United States of America in 1926 in an attempt to return him to Arizona, the natural habitat of Thunderbirds. He was described by Newt as a majestic, powerful, and regal creature, but a wee-bit sensitive to strangers.
After the battle against Credence Barebone and Gellert Grindelwald, Newt gave Frank a vial of Swooping Evil venom, which was diluted by the latter in a storm the former conjured to wipe New York of the memories of the devastation. Frank managed to return to Arizona after being released.