Aussies have been left outraged after footage of a group of men laughing as they kicked and threw rocks at a defenceless kangaroo went viral online.

The group of men were seen repeatedly antagonising the kangaroo in the shocking clip believed to have been recorded in the Northern Territory and shared to Instagram by @crossthecreekboys in May.

At one point, one of the men lifted the kangaroo off the ground by its arms before slamming its head into the tow bar of a parked Nissan Patrol.

In another distressing moment, one of the men kicked the back of the kangaroo's head while another stood on its tail.

Aussies Against Animal Abuse has reported the video, which has been removed from Instagram, to the police and animal welfare authorities.