Dead cats hung on display on fences in a rural area north of Auckland will be investigated by the SPCA.
Kim Powley came across a dead cat hung over a guard rail on a road north of Auckland this week.
She first assumed it had been hit by a car but had since found or been told about eight more cats - each strung up along the road for all to see.
''One of the cats had an eye hanging out of it's head and another had it's intestines stuck to the fence,'' she said.
She had no doubt the cats had been purposely killed.
''We were disgusted, as obviously it was no coincidence.''
Wild cats were a problem with wildlife in the area and were sometimes culled, she said.
''I understand that culling wild cats is needed to keep the population down but this is disgusting.''
Auckland SPCA chief executive Christine Kalin was unaware of the killings when contacted by Fairfax Media today but said, on the surface, it appeared to be ''something at the extreme end of brutality'' and could be a breach of the Animal Welfare Act.
An SPCA inspector was going to investigate.
Under the Act, people who kill an animal ''in such a manner that the animal suffers unreasonable or unnecessary pain or distress'' can be jailed for up to a year, or be fined up to $50,000, or both.
Powley, 19, said she has started keeping a closer eye on her own three cats.
She planned to contact the SPCA about the incident.