"Maximizing production per acre by planting trees in high densities requires careful assessment of the vigor potential of a site."
https://extension.psu.edu/beginning-grower-planning-and-planting-an-orchard
"An average orchard can have around 36 standard-sized apple trees per acre. If you have semi-dwarf trees, you can fit 170 per acre, while up to 400 dwarf apple trees can fit in the same space."
https://thehomesteadinghippy.com/apple-tree-density-per-acre/
"As you add more chickens, the grass is destroyed even faster around the chicken coop, and for a greater distance as well. At really high densities, the only remaining grass, if any, will be far away"
"At a stocking density of 50 hens per acre, the hens will add 2.5 tons of manure per acre per year, equivalent to 106 pounds of nitrogen, 30 pounds of phosphorus, and 61 pounds of potassium. That’s about as much as most chicken yards can absorb unless you go to a lot of extra effort. Fifty hens per acre has been considered to be the free-range sweet spot for over 100 years."
https://www.plamondon.com/wp/how-many-chickens-per-acre/
"Chickens are omnivores, just like us. This means that naturally, they would eat seeds, plants, insects, earthworms, snails, small animals such as frogs, mice, and even some snakes."
https://www.heritageacresmarket.com/what-do-chickens-eat/