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Drawn into the township by the lure of human food, kea are then attracted to lead roofing nails, which taste sweet to them.
Laura Young, of the Kea Conservation Trust, told RNZ lead was not good for the birds' stomachs and so far seven have died.
"Last year, between October and November we had six [kea] deaths at Arthur's Pass," Dr Young said.
"We were able to get four of these post-mortems that showed in at least three of them, lead poisoning was implicated in their death.
"And one of the side effects of it is that they starve over time due to the effects of lead toxicosis, so that definitely caused two of their deaths."
She said most of the young birds' tested have shown high levels of lead in their blood.
"Over 90 percent of young ones [that have been tested] have lead poisoning ... so that's about 20-25 birds that were tested."
There had been about 30-40 kea coming and going into the area over the past year, Dr Young said.
She says the birds have always been attracted to areas like Aoraki/Mt Cook village, Franz Josef, Arthur's Pass, and Fox Glacier as well as buildings and cars.