Students from a private all-boys school in Sydney are being investigated after they were filmed tackling live sheep as part of what they call a training exercise.
A group of boys can be seen crash-tackling and dragging sheep across a farm in Orange, New South Wales, during the April school holidays.
A person can be hear saying "Flip 'em, boys!" in the video which appeared on Facebook, and one boy is seen trying to ride on a sheep's back.
RSPCA inspectors are today questioning the school's headmaster, Tim Hawkes, according to 9 News.
"The two rugby coaches involved were assured by the farmer beforehand that the activity was safe and all the more so because he would be supervising it carefully," Hawkes said in a statement to 9 News.
"No animals were injured in the exercise. Neither were any boys."
But RSPCA chief executive Steve Coleman says the footage is "horrific and disgraceful".
The school has produced many Wallabies players, including Stirling Mortlock and Julian Huxley.