Why are kakapo extinct?

Māori settlers from Polynesia hunted the Kakapo for food and for their skins and feathers, which were made into luxurious capes.[47] They used the dried heads as ear ornaments. Due to its flightlessness, strong scent and habit of freezing when threatened, the Kakapo were easy prey for the Māori and their dogs. Their eggs and chicks were also predated by the Polynesian Rat or kiore, which the Māori brought to New Zealand