The dead birds left on the steps of Parliament.

Several fake 1080 pellets have been thrown into Parliament as protests against the pesticide heat up.

The pellets made it through grating into an antechamber just before the main doors onto the first floor foyer, just as politicians were due to walk through to the House for Question Time on Wednesday afternoon.

A security guard let a man in a Hazmat suit into the antechamber to collect the pellets, which were accompanied by several dead birds.

Henry Cooke/Stuff A man in a Hazmat suit collecting pellets from the main stairs of Parliament.

One of the protesters later ate the pellets to prove they were fake, and a Parliamentary Services spokeswoman said she doubted they were real.

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"We have been advised by DOC that the pellets are unlikely to be 1080 pellets. They have all been cleared from the scene and the area has been hosed down as a precaution," the spokeswoman said.

LUKE KIRKEBY/ STUFF Use of the 1080 pesticide is provoking strong feelings

Police and DOC staff attended the scene.

National Leader Simon Bridges said New Zealand had a long history of protest but that sort of action took it too far.

Green co-leader Marama Davidson said the protesters have "valid concerns" but it wasn't the type of protest action she would take.

"We need to listen, and we need to have community-led conversations about this.

"They are trying to be heard, and we will need to keep listening."

National Conservation spokeswoman Sarah Dowie said this kind of comment from Davidson was embarrassing for fellow Green MP and Conservation Minister Eugenie Sage.

"It shows that the left hand doesn't know what the right hand is doing. Her comments have basically undermined Minister's Sage's efforts."

Anti-1080 protesters marched on Parliament in their hundreds on Saturday calling for an end to the use of the pesticide.

It was part of a nationwide series of protests attended by thousands.

Some of the protesters at Parliament wore skull and crossbones capes, chemical hazard suits and masks while others dressed in black with white crosses to symbolise the loss of the wildlife they say was killed by the poison.

A small number have camped out on Parliament's front lawn since then, writing messages in chalk on the border of Parliament's grounds.

The Department of Conservation, Federated Farmers, and Forest and Bird all support the use of 1080 but several groups have been outspoken in calling for it to be banned claiming it kills native animals and birds.

Supporters say predator pest numbers are so high that without serious action some native forests would be seriously damaged.

The independent Parliamentary Commissioner for the Environment has found that 1080 is the best option for protecting New Zealand's wildlife.