I have always admired English hedgerows which are basically a living fence of closely planted trees and shrubs. If well maintained they are strong enough to contain cattle. They also provide cover for a large community of birds, animals, and insects and give the English countryside its distinctive soft green look.
Here in Bonaire they have a similar concept, but in this arid climate different plants must be used. The candle cactus (Pilosocereus lanuginosus) is used and woven between wire, instantly providing an animal proof fence.