Emus do not seem to have any sense of personal space. The get too close, pick and pull and generally make a nuisance out of themselves. Some animals are fine with that, others might not be. Any chance our emus get, even through the fence, they pull on the donkey's tails and manes, try to pick at their faces and generally make nuisances out of themselves. Keeping them together would be a recipe for disaster, especially with a skittish mammoth donkey like our Jack. The emus run with the fainting goats all day long without problems because the girls head butt them when they start pestering them. They leave the adult chickens alone but chase the juveniles around the pasture. We are working on stopping that behavior.