National Party leader Christopher Luxon makes shock Bird of the Year announcement

National Party leader Christopher Luxon has made a shock announcement that could have a major impact on voting this year.

Reading a prepared statement on camera, Luxon reflected on his time in politics and said many would find his revelation "unexpected and sudden".

"This is something that I have thought about and put a lot of thought into and reflected on for some time. Because after many robust discussions with my colleagues, and also my staff, and importantly my family, I have made a very tough decision I wanted to share with all of you here today," he warned.

"And while I appreciate this may disappoint many of our supporters, I do this with a very heavy heart, knowing the consequences of the full weight of my decision. Because today I announce that I am supporting the wrybill for Bird of the Year 2022."

Luxon then refused to take questions and walked off stage.

The Bird of the Year contest helps raise awareness for New Zealand's native species, many of which are under threat.

Luxon's choice, the wrybill, breeds in the braided rivers of the South Island and faces a high risk of extinction in the medium term. The Department of Conservation said it is the only bird in the world with an asymmetrically turned bill - its bill curves to the right, allowing it to probe for insects under river stones.

Last year was won by the long-tailed bat, while second place went to the kākāpō and the titipounamu got third. Previous years have been hit by scandal, including allegations of fraudulent voting and Russian intervention.

Voting in the competition closes this Sunday with the winner announced Monday - so if you're waiting to have your say get in quick on the Bird of the Year site.