And here's why...
Although fences have been suggested as a deterrent to keeping cats out of
sensitive bird nesting areas, there is no evidence to show that any fence (unless enclosed on
the top) is effective in keeping cats out. Coman (cited in Potter 1991) reports that fences have had
poor results, even electrified ones, and they are expensive. During the tracking
portion of a study by Carol Fiore, urban cats were routinely seen scaling privacy fences 8 feet tall,
climbing on roofs, up trees, and over every obstacle in their path. The use of an electric
fence carrying 6.0kV along plain wires spaced 60-90mm intervals around an enclosure in the Northern
Territory of Australia did not comprehensively exclude cats (several cats got in!), and Coman
reports that various predator fences were tried with less than satisfactory results in wildlife parks in other
places in Australia (Potter 1991). Coman goes on to say "With cats, height of the fence
is immaterial as they are adept climbers. Almost certainly, electrification of the fence would
be required and, even then, it is difficult to avoid weak spots, particularly at corners or over rough terrain.
Cost is likely to be very high, and of course, the possibility of short-outs and breakdowns can
render the whole fence inoperable."
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