A couple things that we do know about theropods-the ones that most closely related to birds-is that they brooded their nests. If you go deeper in the tree, what you see is that for sauropods, we have no direct evidence that they returned to the nest after the eggs were laid. Most of the evidence for that comes from an excavation in Argentina called Auca Mahuevo. What's thought with sauropods is that they'd just lay a bunch of eggs and leave them alone-the turtle model. Few of those would ever reach adulthood. (Mark Norell)

A couple things that we do know about theropods-the ones that most closely related to birds-is that they brooded their nests. If you go deeper in the tree, what you see is that for sauropods, we have no direct evidence that they returned to the nest after the eggs were laid. Most of the evidence for that comes from an excavation in Argentina called Auca Mahuevo. What's thought with sauropods is that they'd just lay a bunch of eggs and leave them alone-the turtle model. Few of those would ever reach adulthood.

Mark Norell

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bunch comes couple direct evidence excavation few lay leave model nest ones reach see thought tree turtle adulthood things argentina auca eggs

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