Thousands of sheep in Australia die from ‘banging their heads till they crack open'

North West Local Land Services regional veterinarian Bob McKinnon told the Sydney Morning Herald that once sheep started eating the plant they exhibit behaviour “similar to that of a drunk”.
“They lose weight to start with and then get staggery, the progression gets worse, they get unco-ordinated and depressed, they don't know where their feet are.”
He said that “staring eyes”, “head pressing” and “muscle tremors” were other symptoms, until eventually the animals “just go to a post and bang their head on it till they crack their heads open”.
The task of bringing in herds that would normally take six hours instead takes “days”, Mr McKinnon said. “It’s like dealing with a thousand heroin addicts.”