1900–1913
Wellington Field Naturalists
With membership primarily from the Ontario Agricultural College, this Club published the annual Ontario Natural Science Bulletin from 1905 to 1913, covering a wide range of topics.
1923–1957
Wellington County Fish and Game Association
Supported mainly by local industrial and commercial firms, it emphasized sporting aspects, such as trout restocking and pheasant release, but was also concerned with conservation.
1947–1957
Traverner Field Naturalists
Named after the great Canadian ornithologist, it drew its support from OAC staff members, and sponsored weekly columns in The Mercury.
1957–1964
Guelph Field Naturalists (Phase I)
The two preceding organizations co-operated on weekly columns in The Mercury, and joined forces in 1957 with emphasis on education and field trips. Interest waned and the Club became dormant until it was revitalized in 1966.