Series Scope and Contents From the Series: This series contains research articles compiled by Burghardt related to animal play behavior and other related topics including anthropology, biology, ethology, evolutionary psychology, ontology, and much more. Burghardt's correspondence with other research scholars is also included. Materials include drafts, photocopies, and printed articles. The series is arranged alphabetically by the first listed author or by non-Burghardt correspondent. In some cases, Burghardt filed articles...