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Secondarily featherless dromaeosaurs?



What's the current thinking, if any, about the
feathered or non-feathered status of the larger
members of theropod groups now known to have had
feathered members (like therizinosaurs or
dromaeosaurs)?

How were these ideas reached?

Was _Utahraptor_ feathered?  How about one of those
honking big (to use the scientific phraseology)
therizinosaurs?  

Sorry if I am rehashing old ground.

Thx,

=====
Larry

"I've been ionized, but I'm okay now."

http://members.tripod.com/~megalania/index.html
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