“It’s yet another chapter in the dispersion of these dinosaurs that we did not know about.”
isn’t like other known South American duck-billed dinosaurs, or like any from the old southern supercontinent of Gondwana, which included what came to be South America. Until now, all known duck-billed dinosaurs from Gondwana were hadrosaurids, which had their heyday in the late Cretaceous and had such efficient, stacked, plant-pulverizing teeth that they chewed their way to nearly global dominance, outcompeting other herbivorous dinosaur groups.
For example, rather than a single colonization of the continent, the team thinks that duck-billed dinos arrived in South America from North America in two separate waves. “We suspect our kind of duck-billed dinosaur arrived earlier into South America and reached further south than the hadrosaurids,” says Alarcón-Muñoz, describingas a relict. “In most other places of the world, this kind of dinosaur had already gone extinct by this time.
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