Rabbit Electric Fencing
Rabbits can devastate an area VERY quickly. To keep them out is fairly straightforward and can be done in one of two ways.
Electric rabbit netting is great for flat areas or areas with closely cropped grass. The netting starts off with 5cm horizontal spacings and these only increase to 10cm high after the 30cm mark. This provides pretty much blanket coverage of an area that a rabbit cannot penetrate. The close proximity of the bottom strand to the ground means that the net could be prone to a slight earth leakage if the vegetation grew up and into it. This isn't a problem if using a larger energiser but may effect the smaller models.
Post & Twine / Wire Electric Fence
This is the prefered option if the fence is to be a semi-permanent or permanent fenceline. Wooden stakes hammered into the ground at 5m intervals with wire or polytwine at 10cm intervals should be enough to deter them. Using this method, you can hug the groundcontours as closely as necessary.
Occassionally the rabbits learn to jump through the wires. As they are going between two live electric fence wires mid-flight they rabit does not receive the shock. The way to resolve this is by adding another line of twine and rather than connecting this to the other wires, connect it to the earth stake. This will cause the rabbit to touch both a live and an earth wire and so receive the shock.