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Migration & feeding habits

In Horner's book,"Digging Dinosaurs" there is mention of a mass of duckbill
bones he believes were all deposited at one time, and probably as a result of
a catastrophe while migrating. I wonder if most dino herbivores followed the
greening-up of the countryside as present day veggie-eaters do. Also, was the
quest for food, for themselves, the deciding factor, or was the special needs
of hatchlings the motivating factor? Was there enough seasonal change to
account for such migrational patterns? Could it be that egg carrying females
required special diets that was only available at certian times of the year?
Is there any hard evidence concerning any of this?

Waterfowl that fly past the arctic circle to breed have a bunch of reasons
for doing so. The longer hours of daylight speed growth in not only their
young, but the swarms of bugs they eat. There are fewer preditors up there,
and it doesn't get blistering hot. There are probably more reasons for their
migration patterns, but this is only a prelude to a point.

Could the evidence of a transition from dinos to birds lie in behavior, if
not in the fossil record?

Qietly musing, in the aftermath of "MY" Razorbacks loss. :-(