Here is one of twelve collages on The Permaculture Principles and how they might be applied, especially in the maritime Pacific Northwest. Concepts from David Holmgren's Essence of Permaculture.
"Integrate rather than segregate."
Create efficiencies and resiliences (Yin and Yang, if you will).
1. This is the poultry moat/orchard, an example of function stacking. Outside fence, slowly becoming a hedge that yields blackberries, plums and wild cherries, is a woven wire deer fence for excluding deer, coyotes and stray dogs from poultry area and garden. Inside fence, lower left, is a welded wire poultry fence and keeps poultry out of the garden until wanted. Fruit trees are planted on a north-south axis to shade one another's roots. They also provide shade to poultry as well as protection from glide-path predators. Poultry pick up fallen fruit and predate on slugs, snails and insects headed for the garden, drop some fertilizer. Chickens, ducks and geese have overlapping but not identical dietary interests.
2. Polyculture; species mixing. Different perennials and annuals mix it up in some beds with a range of heights and leaf and root patterns, allowing some plants to look for slightly different nutrients and water profiles than others, varying sunlight and shade, hiding some plants better from their predators. We never got the hang of companion planting charts but sometimes we get lucky!
3. Variation in height; trellised crops alternate with low-growing spreading crops, assisting each other with partial shade, moisture conservation and weed suppression.
4. Graze; instead of gathering a bushel of this here and that there, one can work one's way up a single bed, finding what's ripe and what's appealing and bring in a fresh meal. Potentially what you're bringing in has less predation, less nutrient depletion, less drought shock, was what your body was really hungry for, and will be eaten fresher. Do the same for poultry or stock; they like their lettuce in season as well.