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Thunder was an individual Argentinosaurus from Wonderbook: Walking with Dinosaurs.

In Wonderbook: Walking with Dinosaurs

Thunder was the father of Storm and leader of his herd. He is first seen arriving at his nest, scaring away a pair of Pterodaustro. Later, Storm grows larger and they encounter a pack of Mapusaurus, including their leader, Flint. Thunder scares them off. During the herd's migration, Storm became the new leader of the herd. But Thunder was weaken of old age, and was subsequently eaten alive by Flint and his pack.