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Re: origin of feathers
-----Original Message--From: Earl Wood <firstname.lastname@example.org>Date: 13 April 1998
>John V Jackson wrote:
>> -----Original Message-----From: Earl Wood Date: 11 April 1998 08:12
>> > Would someone like to speculate on the possibility that pre
>> >feathers were brought
>> >about by the need to modify the skin in order to prevent serious sun
>> >burn from the sun
>> >or some other source of radiation which was probably very prevalent at
>> >different periods
>> >of time. $0.02 worth.
>> > Earl
>> I would imagine early birds would have no greater need for this than
>> immediate predecessors, who presumably had the "standard" "reptilian"
>> John V Jackson email@example.com
> It has been suggested by some that temperature may have been the jolt
>needed tostart the growth of hair or feathers, My thoughts follow this
>and that over a good deal
>of time radiation ( U V ) might have contributed to the change from scales
>hair or feathers for insulation of this sort.
> Thanks for your thoughts.
I think I'm just going to have to say "maybe" on that one ! Sorry if you
wanted better thoughts than that, but I haven't a confident clue as to why
pre-feathers evolved, only a few ideas. However, I think UV wouldn't have
posed a very challenging problem to evolution unless the levels were very
diffferent during early bird evolution than now.