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Re: Evidence For a Feathered Velociraptor...

Thanks for explaining.

In light of the explanation, I have to wonder if quill knobs evolved for the obvious logical reason.

Evolution is strange. You'd expect some logic to it, but maybe there isn't any.

No bird wants to have to regrow its display feathers more than once or twice a year.

I'd be pretty surprised if those big therapods could fly. Especially with their short forelimbs, LOL!

Dora Smith
Austin, TX
----- Original Message ----- From: "Michael Lovejoy" <michael@lovejoy-horses.co.uk>
To: <dinosaur@usc.edu>
Sent: Saturday, September 22, 2007 4:40 AM
Subject: Re: Evidence For a Feathered Velociraptor...

Quill knobs will only appear where feathers need to be firmly anchored to
resist external pressure; so when you see them on the forelimbs they
normally indicate flight feathers. So you won't see evidence of feather
attachment elsewhere on the skeleton, although a nicely preserved
Microraptor himblimb could be interesting...
It's been a while since I did anything on this subject, but IIRC the
feathers don't actually reach the bone; the roughness / ridge/ knobs on the
bone are caused by the tendons and muscles used to anchor the quills.

This Velociraptor specimen seems like good evidence for GSP's secondary
flighlessness thing - unless there's another reason for large, strongly
attached forelimb feathers.

Michael Lovejoy

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