[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: feathers as N2 excretors

In a message dated 10/16/98 10:22:16 AM EST, 102354.2222@compuserve.com

<< Still, his idea is novel (at least to me -- does anyone have
 references for where this idea has been proposed before)? >>

Novelty of idea seems to be proposal that feathers had a metabolic origin,
which would >compel< their appearance by establishing some kind of prior need,
rather than simply accepting their appearance as a random fact of evolution
that became exapted a posteriori. Who knows whether, specifically, sulfate
excretion was necessary in protobirds--and, if so, what did protobirds do
about it before they had molting of feathers? That part of argument is
certainly questionable.