Decapitated roo found in outer Melbourne

A kangaroo has been decapitated and its head left on a barbecue plate at a popular picnic area in Melbourne.

Police say the kangaroo and a skinned rabbit were found at the Diamond Creek Walking Trial picnic site about 8.20am on Tuesday, Australia Day.

When police arrived, they found the head of the kangaroo on a barbecue plate, while the body was located about 60 metres away, Victoria Police spokeswoman Leading Senior Constable Lee Thomson said.

Witness Michael told 3AW radio he was jogging when he came upon the terrible sight.

"I was just at the jogging track and there's about 10 police here. Kids have put the kangaroo on a public barbecue and have turned it on," he said.

"There's a lot of families here. Police have covered it up in plastic because there's a lot of kids around."

Police are asking anyone with information to come forward.

Witness Michael told 3AW radio he was jogging when he came upon the terrible sight.

"I was just at the jogging track and there's about 10 police here. Kids have put the kangaroo on a public barbecue and have turned it on," he said.

"There's a lot of families here. Police have covered it up in plastic because there's a lot of kids around."

Police are asking anyone with information to come forward.