Congratulations! You have found the reasonably esoteric "thread within a thread"!
oh dear, have i ever.
There certainly are indicators that it was used for something, but it may be specific to something we cannot measure, such as mating behavior.
a popular theory is "getting up off the ground." doubt that has TOO much weight to it, but they certainly seem to be very ineffective for hunting.
It was no problem for T-rex to outrun Triceratops or a Hadrosaur, but outrunning T-rexes in competition for food is something else entirely.
there was some suggestion for a while that t. rex was a sprinter at best, as he's not really built for speed in any way. i think the argument had mostly to do with leg proportions -- he doesn't have a leg structure conducive to a good run. so the idea that he feathers would have been much use at all for lift is kind of suspect if he's not that good of a runner.
but if you have any good information on this, i'd be interested in what you (or dr bakker!) has to show. (hey, one can keep dreaming, right?)
Excellent point on the feathers (downy vs. flight). However, I was referring to the initial functional jump, not the now-known path of it's development. There must be an additional selectional step to focus on downy feathers to push them toward feathers capable of flight.
i'm not totally sure.
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