Raymond Ditmars (1876-1942) is an inspiration to all those interested in the field of Zoology, professionally or recreationally. His books read almost as a set of journal entries from Ditmars' wild adventures as a Zoologist at the NY Zoo and beyond.
Dated information, of course, but still a fun read. I just love it when the author refers to a snake as "savage" or "grotesque." It really is from another era.