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We were having issues with an annoying crow who repeatedly yanked out my pepper seedlings to get at tasty worms/other bugs below. Thankfully this old window screen mesh proved to be enough of a deterrent.
[Image description: a raised garden box with pepper plants. Around the base of the plants is a mesh screen, held in place with rocks and stakes. A cat is staring at the camera in the background.]
That's brilliantly functional and simple to do. Good idea. I should have done something like that when I planted saplings in a low box on the balcony. My cats dug them out out of curiosity (thankfully they did not use the box as a litter box), thankfully I had more unplanted saplings that I was going to give away otherwise, and the cats were not allowed out on the balcony again until my tomatoes grew bushier and taller.