Flat Holm Island has a long-established rabbit population, introduced for farming as early as the twelfth century. In 1492, the island's tenant was said to be making considerable profit from the rabbits, which have continued to thrive despite suffering from myxomatosis.

(Glamorgan Inventory Archive: NMR MS GLI04/03/18; Worrall and Surtees, Flat Holm: An Account of its early History and Ecology (Cardiff: 1984), p. 35)
A.N. Coward, RCAHMW, 23.05.2018