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Re; Bloddy feathers and flicky tails

Richard Travsky said:

<Not mere rolling on the ground, I had more in mind the image of the
predator hanging onto its prey, and both rolling together. That's a lot
of weight and momentum, esp with big prey.>

It seems to me that what you're seeking is fossil evidence of a
fundamentally maladaptive behavior. Neural spines that break during the
struggle for food would not be an enduring evolutionary characteristic.