A baby wallaby had to be euthanased after wildlife carers found its dead mother tied to post with a cigarette in its mouth and a can jammed in its pouch.

Warning: This story contains descriptions and an image of animal abuse.

The female joey was found alive but with head injuries in the pouch after the grim discovery at Tinaroo, south-west of Cairns in far north Queensland. 

Atherton-based wildlife carer Julia Howard, from the Agile Wallaby Project, was on her regular rounds of Tablelands roadsides to check deceased mothers for live offspring when she found the disturbing scene on New Year’s Day. 

The retired nurse said a rope she found around the mother’s neck was tied "very tight". 

However, it was not possible to determine whether the wallaby was already dead when it was tied to the post. 

Julia Howard has been a wildlife carer for about four years. (Supplied: Julia Howard)

"It’s horrific. Even if she was [already] deceased, it's not a nice thing to do," Mrs Howard said. 

"That someone could even think this was a joke, and that they didn't even check to see whether she might have had a baby in the pouch. 

"She's obviously had trauma from what they were doing to the mother."

'Pretty traumatic'

The ABC has seen a photograph of the wallaby, with a rope around its neck attached to a roadside signpost, a cigarette in its mouth, and a yellow drink can visible in its pouch. 

While Mrs Howard is used to finding dead wallabies, the carer of four years said it was a very distressing morning. 

Shai Ager says more education on rescuing joeys from the pouches of stricken agile wallabies is needed. (Supplied: Inntronimagery (Instagram))

"When a wallaby has been injured by a car, it's pretty traumatic, whether it's a head injury or broken legs," she said.

"There were no other visible injuries, which makes me wonder if she actually died of fright.

"Usually, I can tell whether animals have been hit by a car or bitten by a dog or something.

"There was absolutely no sign of that at all."

Authorities investigating

Agile Wallaby Project founder Shai Ager said she had reported the incident to police and the Department of Environment, Tourism, Science and Innovation (DETSI).

"Police are aware of a social media post and a report has been made in relation to this incident and are making further enquiries with the community," Queensland Police Service said in a statement.