Alison Ballance joins the kākāpō recovery team on Pukenui Anchor Island to hear how the 2021/2022 kākāpō breeding season is going.

It's been very quiet on the kākāpō front for the last two years, but this year is another big one for the rare bird.

In 2019, the endangered flightless night parrot had its largest breeding season on record, as recounted in the RNZ podcast series the Kākāpō Files and Voice of the Kākāpō. After a rollercoaster ride of successes and setbacks, 72 chicks fledged, temporarily boosting the kākāpō population to 213 birds.

Since then, there has been a slow attrition due to deaths of both old and young birds, which saw this breeding season kick off with 201 birds.

Most importantly, this number included 57 females of breeding age, which are spread across three southern kākāpō islands: Pukenui-Anchor Island (in Fiordland), Te Kakahu-Chalky Island (also in Fiordland) and Whenua Hou-Codfish Island (near Stewart Island). Forty six of those females have bred this year, laying a grand total of 139 eggs.

By autumn, 57 chicks out of the 60 that hatched were doing well, most of them being raised by their mothers or foster mothers. In previous breeding seasons many chicks have been hand-reared, but Deidre Vercoe, manager of DOC's Kākāpō Recovery Programme, says that this year the team was taking a more hands-off approach. This meant no double clutching, and most eggs were left to hatch in nests rather than in incubators.

There is now a much greater reliance on technology to allow remote monitoring, with every bird wearing a smart radio transmitter that sends information about the wearer to a centralised computer database. Te Kakahu-Chalky island is the most hands-off breeding island, and indications from activity records being sent remotely from the three nesting mothers suggests they are still raising the island's three chicks.

Aspergillosis outbreak

Unfortunately, the onset of autumn marked a bit of a turning point in the breeding season. After a period of hot dry weather in Fiordland, the female Jemma, on Pukenui Island, died from aspergillosis. This fungal disease can be deadly, with nine kākāpō dying from it in the 2019 breeding season, although a number of other kākāpō were successfully treated.

A second Pukenui female, Roha, has since been diagnosed with severe aspergillosis and is fighting for her life at Auckland Zoo. Some chicks are at the Dunedin Wildlife Hospital being treated for aspergillosis as well as injuries such as broken legs…

Go to this episode on rnz.co.nz for more details