Up to 100 animals were slaughtered.
Animal welfare groups have condemned the slaughter of up to 100 native animals in Hobart's north in the past two months.
Almost 100 kangaroos and wallabies have been found clubbed, bitten and possibly shot, at Glenorchy tip and nearby Tolosa Park in the past two months.
Police believe the attacks happened outside the tip's opening hours.
Inspector John Arnold says some of the animals had been trapped only to escape and later die from the shock.
"So we're having some animals that are dying at the time but it may well be that some are dying as a result of that two or three days down the track."
It appears most of them have been clubbed to death, some have exhibited animal bites and we're not ruling out that some of them even died as a result of firearm wounds," he said.
Police says dogs were used to trap the animals.
The RSPCA's Paul Swaitkowski says it is deplorable.
"To me it sounds like people are getting their jollies, so to speak, by killing, maiming and slaughtering animals which can't defend themselves," he said.
Anyone with information is urged to contact CrimeStoppers.
