evidence: In agricultural and residential areas, porcupines cause a variety of unwanted damage. Fruit and ornamental trees, sweet corn, alfalfa, and small grains are often consumed. They have also been known to chew on wooden tool handles and canoe paddles in search of salt and buildings in search of plywood resins. They also pose a significant threat to domestic dogs, which never seem to learn to leave them alone. The best strategy to prevent damage from porcupines is exclusion. Fences, climbing barriers, and cages around plants are commonly used. For gardens, 18 inch tall poultry wire with a smooth electric wire 1.5 inches above the top is effective. Also, a simple smooth electric wire 4-6 inches above ground can provide adequate protection. This also prevents beaver damage. Of course, porcupines are not the only pests to exclude from your garden. Javelina, wood rats, deer, elk, etc. must also be considered. [...] Porcupine Ecology and Damage Management Techniques for Rural Homeowners , Utah State University Extension www.wyomingextension.org/agpubs/pubs/B1073.pdf