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When the dinosaurs were born?

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Quick Answer. The earliest conclusive evidence of the evolution of dinosaurs dates their origins to 230 million years ago. They are believed to have evolved from other reptilian species and developed certain defining characteristics, such as specialized hip and leg bones. read more

How dinosaurs were born to be big: Their biology 'was skewed towards giant species' Palaeontologists had thought size distribution among dinosaurs was similar to modern animals read more

This means that the majority of the dead dinosaurs were yearlings that were still growing extremely quickly. From this Woodward and her colleagues calculated that baby Maiasaura faced an 89.9% mortality rate in their very first year. read more

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