Our expert says:
This is really a practical problem and you will ultimately have to consider practical solutions. It would be a pity to stop your kittens from going onto the balcony. The best would be to fence the opening between the wall and the roof using plastic or wire mesh or even wooden lattice. Ideally you should fence it on the outside of the wall so the cats can still sit on the wall and look out. You could also think about putting bubble wrap or sandpaper on the top of the walls or even spraying it with citronella or eucalyptus oil, which may deter them but is not totally safe, obviously. Wall spikes, particularly Eina Ivy, also stop cats from walking on top of walls as does electric fencing.
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