They are chill when you drive past them.

They can be a hazard for vehicles if in an accident, because of their size. Think moose size.

The main feralness is that they can smell water, and will head to water-mills to get a drink. They destroy water tanks and pipes to get access. Can’t blame them, the outback is hot.

Also can outgraze native animals for grasses and shrubs.

Water-mills look like this: