 He described the social and breeding behaviour of the red deer, gulls, and the grey seal respectively, in the three academic works "A Herd of Red Deer", "Bird Flocks and the Breeding Cycle" and "A Naturalist on Rona".The outbreak of World War II put an end to Fraser Darling's hopes of undertaking further research on the grey seal, and being too old for active military service, he chose to farm rather than leave the west coast of Scotland for wartime civilian work.Between 1939 and 1943 Fraser Darling reclaimed derelict land to agricultural production on Tanera Mòr in the Summer Isles, an undertaking described in his 1943 book "Island Farm".