Unwitting Travelers is an encyclopedic collection of 234 primate reintroduction programs that were conducted between the 16th century and the present. The author, Benjamin Beck, combs through more than 600 sources to document the location, dates, species, numbers of animals, methods, purposes, and outcomes of each program. His work reveals that more than 24,000 primates have been reintroduced in the wild. With only a single exception, the...