My wife and I did a drive-through Safari park thing in Arkansas a few years back. You get a bag of feed each and can feed anything that's allowed to approach cars, including emu.

There's one spot where there's a bridge over what's effectively a ditch with a small creek running through it. A few emu followed us around the park, but several of them camped out on the far side of the bridge.

When I drove into the bridge, they all moved to the middle of it and boxed the car in. They wouldn't let us pass until most of them got a handful or so of food.

It was quite surreal, and I don't know that I'd enjoy trying to run a farm of large birds like that.