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Segregated vs age-mixed sauropod herds

From what I've been reading, there seems to be a good amount of evidence for segregated sauropod herds, but not as much for mixed age. If there were mixed age groups, would the youngsters have been cared for at birth until they were older as some accounts suggest? That seems silly to me, as the food requirements for sauropods would cause the herd to constantly keep moving, and all those little feet would surly slow the faster moving adults. Or, would the lighter juveniles be able to keep up with the weightier adults? I recall reading that there are sauropod trackways with juveniles in tow to support the mixed theory, but are there bone beds too? I suppose that there were many different strategies that were employed by the many sauropod species, just like the many kinds of child rearing/abandoning behavior in crocs and turtles.