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Bird origins tied to oversized muscles and lack of brown fat



From: Ben Creisler
bh480@scn.org


A new theory on the origin of birds:

Stuart A. Newman (2011)
Thermogenesis, muscle hyperplasia, and the origin of birds
BioEssays (advance online publication)
DOI: 10.1002/bies.201100061
http://onlinelibrary.wiley.com/doi/10.1002/bies.201100061/abstract

No official abstract but link shows first page of article

A short summary:

http://www.eurekalert.org/pub_releases/2011-06/nymc-csc062211.php

"A developmental biologist at New York Medical College is proposing a new
theory of the origin of birds, which traditionally has been thought to be
driven by the evolution of flight. Instead, Stuart A. Newman, Ph.D.,
credits the emergence of enlarged skeletal muscles as the basis for their
upright two-leggedness, which led to the opportunity for other adaptive
changes like flying or swimming. And it is all based on the loss of a gene
that is critical to the ability of other warm-blooded animals to generate
heat for survival.....".



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