Reviews The Ptarmigan’s Dilemma by John Theberge and Mary Theberge Share this: Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print By Science News June 4, 2010 at 11:15 am The forces of ecology and genetics combine to drive evolution and organize life as it is today. THE PTARMIGAN’S DILEMMA BY JOHN THEBERGE AND MARY THEBERGE McClelland & Stewart, 2010, 416 p., $28.95.