What drives a man to travel to sixty countries and spend a fortune to count birds? And what if that man is your father?
Richard Koeppel's obsession began at age twelve, in Queens, New York, when he first spotted a Brown Thrasher, and jotted the sighting in a notebook. Several decades, one failed marriage, and two sons later, he set out to see every bird on earth, becoming a member of a subculture of competitive bird watchers worldwide all pursuing the same goal. Over twenty-five years, he collected over seven thousand species, becoming one of about ten people ever to do so.

To...