I am beginning to think we are producing a breed of super bunnies.....all fed on our organic veg!!
I seriouly think that some of the adults can clear a 3ft 6ins fence. Typical bunny wire is 1050mm high and should be burried a good 9ins below the soil curving outwards to prevent under burrowing.( Filling the trench with bricks and rubble will make life difficult for them too! ) This drops the height of the remaining wire to about 3ft 6ins. Watch out for equipment near the fence, eg compost heaps, buckets etc as they will use them as trampolines to bounce off! A bunny at full dash can clear quite a distance! Chicken wire buried under gates- a piece 2ft long should do- should help prevent them digging underneath. A bunny can get through and under a gap of less than 2ins so watch out for corners and ill fitting gates! Remember baby bunnies are even smaller! Good luck with your fencing. Yes-the more you do will certainly deter them. Also check for any holes at ground level in the fencing -something chewed a 2ins hole (am sure was a bunny) and when we chased off an adult it ran through the hidden hole at full pelt (that's how we found the hole in the fence!).
Grabbing them by the scruff of the neck and telling them off, before throwing them back in the field, can be quite satisfying!!
Remember - after all that hard work, the pigeons etc etc will pay a visit too!! In the end it's down to how desperate you are not to share your crops with nature!