Actually, before we talk more about why she’s raising the
kids alone, it’s probably time to properly introduce the bird at the centre of
the story.
If you’ve been watching the Whenua Hou nest cam for any
length of time, you’ll already know her. She’s the large mottled presence who creeps
quietly and slowly in and out of the nest cavity, rearranges the chicks with
gentle determination, and occasionally peers directly into the camera as if to
remind us to talk more quietly as the chicks are sleeping!
She is generally almost silent … except when she suddenly is
NOT and at that moment, if you are the foolish thing that stepped near her
nest, you get to hear a noise that sounds like something that might come out of a T. rex.
Her name is Rakiura.
You can’t tell from the live cam (except for a scant few magical
minutes later in the afternoon on a rare day when the sun is so bright it
manages to beam through the dense forest and shine enough on the leaf litter at
her entrance that it tricks the infrared into switching off and we are all instantly
mesmerised by the glory of the nest in colour – hardly daring to take a breath
lest we blow it all away…) but she is a glorious array of verdant mottled
greens.
Moss, fern, and forest floor all blended into one remarkable
bird.
Rakiura is a female kākāpō (Strigops habroptilus),
one of the most endangered birds in the world. Kākāpō are large parrots.
She is named after the Māori name for the
island all but one of the ‘founder birds’ came from (we’ll talk about
founder birds later in the series).
The species is named
after owls.
In typical European colonist fashion, they took a quick
look, saw something vaguely reminiscent of something they knew from the ‘home
country’ and quickly named it after that…then killed it and sent its skin to
whatever museum in Europe would pay them some money.
I know. That got dark quick – it really did and we’ll get to
that part of the story in another blog post too.
A Bird Like No Other
There are currently 236 unique kākāpō officially recorded in
the living population. Every living kākāpō today descends from a tiny remnant
population that conservationists managed to save from extinction in the late
twentieth century.
I say unique because practically everything about them is
unique.
- Only flightless parrot
- Only nocturnal parrot
- Only parrot to use a lek and bowl breeding system
- Only species where all members are tracked with live transmitters
- Only entire species where every member has a personal name
- Only parrot to use a “freezing” strategy for defence
- The heaviest parrot
- The strongest smelling parrot
- Ground nesting parrots
- Unpredictable breeding triggered by infrequent (and often unreliable) mass fruiting of podocarp trees.
- Slow breeders
- Thought to be the longest living bird
- Unusually reliant on their sense of smell
They are also famously friendly — and unfortunately very
bad at recognising (and getting out of) danger.
Why Being Unique Became a Problem
Unfortunately, most of these unique traits have led the
kākāpō to become one of the rarest birds in the world. The very features that
supported it being the most common bird across a pre-human New Zealand, very
quickly led to its downfall.
They nest on the ground, freeze when there is danger and have
a strong distinct odour – this is great when the only land mammal is a tiny bat.
When humans arrive and bring weasels, stoats, cats, possums, dogs, ferrets,
rats, mice, possums and hedgehogs…it’s only great for them. What had been an
effective survival strategy suddenly become a fatal one.
The Slowest Breeders in the Forest
Kākāpō reproduce very slowly. They only breed during the
mast years – the seasons that podocarp trees, like rimu, produce enormous
quantities of fruit.
These mast seasons happen irregularly – perhaps every 2 to 4
years. When they happen food becomes
abundant across the forest, and the number of native insects and birds can rise
quickly.
However, that same food boom for our precious native
creatures translates into a food boom for the introduced pests as well. Pest
numbers skyrocket as they feast on, not only all the extra food but also the
extra insects and birds.
Those introduced pests do not breed slowly. Rats and weasels
now present in New Zealand can produce 6 - 10 offspring every 8 -12 weeks…
It is a brutal ecological chain reaction.
Rakiura’s Home.
After that….let’s go to our safe place!
Rakiura lives on Whenua Hou
/ Codfish Island (her hatch island), it is near the Southern end
of New Zealand. One of the main strongholds of the recovery programme. Now days
humans work hard to keep it predator-free and a safe haven for her and her
relatives to live their best life under the close watch (and yearly health and
transmitter check) of the Kākāpō Recovery team.
The forest here is largely undisturbed, lush, damp and
abundant with all the things that make New Zealand forest a taonga (treasure!).
There are a number of podocarps (evergreen conifers) with rimu as the dominant fruiting
tree – perfect kākāpō food. There are other podocarps here too such as miro, totara
and southern rātā (the tree Rakiura lives under!).
An Experienced Mother
At 24 years old (she hatched during the 2002 season on
the 19th February) Rakiura is an experienced and successful mother.
She currently has nine living offspring, three females and six males, across
six breeding seasons.
Toitiiti (2008), Te Atapo and Tamahou (2009), Tutoko and Tia
(2011), Te Awa and Taeatanga (2014), Tautahi and Mati-Mā (2019).
Deceased offspring: Mokopuna (hatched and died 2008), Tiaho
(hatched 2009, died Mar 2016), Taonga (hatched 2011, died April 2014)
She also has many
grandchicks.
- Acheron - son of Tamahou. Hatched in 2019.
-
Alison - daughter of Tutoko. Hatched 2019.
-
Bravo - son of Te Atapo. Hatched 2019.
-
Deans - son of Tamahou. Hatched 2019
-
Gale - daughter of Tutoko. Hatched 2019.
-
Hau - son of Tamahou. Hatched 2019
-
Kōraki - son of Tutoko. Hatched 2019.
-
Koru – father is Tutoko. Hatched 2019.
-
Mackenzie - son of Tamahou. Hatched 2019.
-
Marangai - son of Tamahou. Hatched 2019
-
Olive - daughter of
Tamahou. Hatched 20 Feb 2022
-
Quill - son of Tamahou. Hatched 2019
-
Scotty - son of Tutoko. Hatched 2019.
-
Tutū - son of Te Atapo. Hatched 2019.
-
Uri - son of Te Atapo. Hatched 2019.
In the 2026 season she may even contribute a great
grandchick to the official population as we know that Gale produced 3 fertile
eggs and at least one male grandchick (Deans) has mated for the first time as a
7 year old this season – so the others may have as well.
Rakiura is still
young by the way. She produced 3 fertile eggs this year, one of which has
hatched and was fostered as Rakiura’s experience was needed to hatch and raise
high value chicks this season.
Kākāpō females can produce fertile eggs from 4 years of age
until well into their 50s and maybe longer.
We haven’t actually known a female kākāpō longer than 45
years and the first female we met was already an adult at that point so knowing
her exact age is unfathomable. We can only know she was an adult at that point
as she had a nest! This was a huge relief and turning point for what was to become
the Kākāpō Recovery Team (up until that point they had been searching for
decades and only found males on the mainland of New Zealand and believed the
population was functionally extinct – more on that another time).
The oldest kākāpō we can be sure of the hatch year of is
Zephyr – she was one of the chicks in that “first” nest found by the team on
Rakiura/ Stewart Island in 1981.
The Nest
Records show Rakiura has used this particular nesting site
during every breeding season since 2008, returning to the same hollow in
the forest whenever the conditions are right for raising chicks. This behaviour
is not common in kākāpō and has proved a marvellous opportunity for the
recovery team to observer her nesting behaviours over many seasons providing
valuable data on nesting and chick raising.
Over the years there have been modifications to keep her
nest safe and dry. It also has a well-placed hatch for monitoring eggs … and
transferring eggs and chicks in and out. This has also made Kākāpō Cam possible – making
all the kākāpō nerds deliriously happy!
And, like every female kākāpō who successfully breeds, she
is doing it on her own.
Which brings us back to the questions that many new viewers
ask when the nest suddenly becomes empty.
Where did she go?
What does she eat?
How long will she be gone?
Where is the baby daddy?
Post Script: Next time!