Cameron Slater and Simon Lusk launched hunting, fishing and game website 'The Wild' on Saturday, which features a cat-killing contest named after Gareth Morgan.

﻿Gareth Morgan wants feral cats killed, but he doesn't want anything to do with a cat shooting contest in his name.

​'The Morgan Score' is a trophy scoring system named after "cat abolitionist" Morgan, which was launched on Whaleoil blogger Cameron Slater Slater's new hunting, fishing and butchery site 'The Wild' on Saturday.

Hunters take a dead cat's measurements in millimetres and add them for a total Morgan Score, earning prizes, according to a Whaleoil post.

CAMERON BURNELL/FAIRFAX NZ Forest and Bird estimate domestic cats kill around 18 million animals in New Zealand each year.

Feral cats are among the biggest threats to New Zealand's native wildlife.

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Alone, our 1.4 million domestic moggies kill more than 18.76m animals a year, according to Forest & Bird estimates.

JOHN BISSET/STUFF The Opportunities Party leader, Gareth Morgan said he was in no way connected to the scoring contest and didn't like his name attached to it. (File photo)

"Wild cats are a destructive menace in the New Zealand outdoors, and only one politician has ever been brave enough to tell the truth about them - that man is Gareth Morgan," Slater posted on Whaleoil.

Slater said he and co-founder of The Wild political advisor Simon Lusk asked Morgan to sponsor them, but said he was "too much of a coward."

PHIL WALTER/GETTY IMAGES Whale Oil blogger Cameron Slater said the Morgan Score was paying homage to Morgan's efforts to cull feral cats. (File photo)

He said Morgan was invited to join them on a cat-shoot during the election campaign in the Hawke's Bay, but he refused.

Slater said Morgan's policy and ideas were good, but no action had been taken: "So we decided to do something about it."

He said he knew of a Hawke's Bay farmer who had killed 56 feral cats on his farm his year and another who had shot 10 cats in public areas.

Invasive Animals Cooperative Research Centre New Zealand has an estimated 1.4 million feral cats.

"[Feral cats] are voracious feeders on bird life and need to be eliminated," Slater said.

But Morgan said he had no idea his name was being used and said he doesn't support what Slater is doing.

"I'd expect it from [Slater] but I don't like it," he said.

The Opportunities Party leader said his view was simple - that wandering cats should be eradicated, but only by authorities.

"[Slater's system] sounds like some sort of vigilante arms lobby instead," Morgan said.

Morgan has long been pushing for regulations around feral cat management and calling for responsible cat ownership.

It seemed Slater was cashing in on his efforts, he said.

Globally cats contributed to 14 per cent of modern bird, mammal and reptile extinctions, and 8 per cent of critically endangered birds, mammals and reptiles globally were threatened by cats.

A lighthouse-keepers cat caused the extinction of the Stephens Island wren, and one feral cat was filmed killing 102 short-tailed bats in the Rangataua forest over seven days in 2010. ​