Re: [RE:Origin of feathers]

["Jonathan" <spockjr@email.msn.com>]

>Interesting, but aren't there fossil birds that show lack
>of blood channels in the bones. Thus indicating that early birds were
ectothermic.
>
>Archosaur J


Actually, a few enantiornithine birds were found to
have growth rings in a few bones which led (i believe)
Chinsamy et el. to decide that they were ectotherms.
This doesn't necessarily indicate ectothermy for them
or in any other earlier birds which have not been studied
histologically.