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Use trees or tall plants for shade if possible but still provide areas of direct sun.
Design for the birds you intend on having.
Pens on the right are grow out pens for hatchlings so they have a raised threshold below doors to keep chicks from running out. They also did not need nesting boxes like the pens on the left.
Don't go by minimum square footage guidelines. Build as large as you can and don't overstock.