For his M.Phil, Gordon studied the ecology of Water Voles at the University of York. His research showed that American Mink were having a serious effect on Water Vole populations, culminating eventually in their extinction. Other studies confirmed that once mink colonised an area, the population of Water Voles crashed: the latter is now classed as an endangered species. From 1990–1995, together with the Vincent Wildlife Trust, he reintroduced wild Otters to rivers in North Yorkshire. This work has proved to be highly successful.
Gordon has written the mammals column in the wildlife reports since 1993.
|British Wildlife 30.6 August 2019||434-456||Wildlife reports|
|British Wildlife 30.5 June 2019||361-380||Wildlife reports|
|British Wildlife 30.3 February 2019||202-222||Wildlife reports|
|British Wildlife 30.2 December 2018||122-142||Wildlife reports|
|British Wildlife 30.1 October 2018||46-66||Wildlife reports|