Paleontologist Pablo Gallina speaks Thursday about a newly discovered dinosaur species of diplodocids. The Patagonia find suggests that not all diplodocids died in the mass extinction. (AP Photo/Natacha Pisarenko)

Paleontologist Pablo Gallina speaks Thursday about a newly discovered dinosaur species of diplodocids. The Patagonia find suggests that not all diplodocids died in the mass extinction. (AP Photo/Natacha Pisarenko)

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