The Herons Handbook - James Hancock, James A. Kushlan - Google Books

https://books.google.de/books?hl=de&id=ldzxpcqepksC&dq=James+A.+Kushlan,+James+A.+Hancock:+Gorsachius+The+Herons&q=Nycticoracini

In this book, the only complete review of the world's herons currently in print, James Hancock distills his knowledge into a concise review of all 47 species and recognized subspecies. The text comprises a thumbnail sketch, including descriptions of…