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 Rhythms of Life unveils, in simple language, Dr. Susan Crockford’s ground-breaking scientific theory on the role of thyroid hormone in evolution, an innovative and comprehensible approach to evolutionary biology reminiscent of Jared Diamond’s Guns, Germs and Steel (1999). From explaining the origins of your family pet to the causes of depression, Crockford’s innovative concept makes evolution personal. Her theory is generating much excitement among scientists worldwide: Richard Dawkins mentions the concept in his recent book on evolution (2004), The Ancestors Tale, as does the PBS (NATURE) documentary Dogs That Changed the World (2007). This is a provocative book guaranteed to change the way you look at the world.
Susan's facinating and thought provoking book is available in paperback and digital (pdf) editions

Susan Crockford, PhD
(Zoology/Evolutionary Biology/Archaeozoology)
Adjunct Professor (Anthropology/Faculty of Graduate Studies),
University of Victoria, B.C. & Pacific Identifications Inc.,
Victoria, B.C. Canada
email: or
see her new book website at


Mister Steer
Montreal QC