Abstract
(1) Occupied breeding dens of foxes were three times more numerous on agricultural land than in hill country managed for shooting red deer, and twice as numerous as on heather moorland managed for red grouse. These differences were probably due to the availability of food. (2) Occupied dens were evenly spaced, and not clumped or randomly spaced. (3) The density of foxes in Scotland UK was much less than in England and Wales or Sweden. (4) Killing foxes in winter did not lead to fewer breeding dens in the following spring.