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Evidence for dinosaur migration

In reviewing the literature on trackways and monospecific fossil assemblages of late Cretaceous North American herbivorous dinosaurs, I come away with mixed feelings about the strength of the evidence with respect to the hypothesis that these animals moved in migrating herds. It is obviously clear that they assembled in large groups for some purpose, but what is the evidence that this demonstrates migratory behavior, as opposed to (for example) communal gatherings for reproduction or nesting? I admit my references on this topic are a bit dated (back to the late 90's), so if anyone could share their thoughts or more recent references to articles on this point, I would greatly appreciate it.