The
kakapo is a large, flightless parrot from New Zealand and one of the
rarest birds of all, with only 124 individuals alive today. The main
reason for its decline is predation by introduced mammals, particularly
feral cats.
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The
New Zealand parrot superfamily (
Strigopoidea)
consists of three
genera of
parrots,
Nestor,
Strigops and the fossil
Nelepsittacus.
The genus
Nestor consists of the
Kea,
Kākā,
Norfolk Island Kākā and
Chatham Island Kākā,
while the genus
Strigops contains the iconic
Kākāpō.
All extant species are
endemic to
New Zealand. The species of the genus
Nelepsittacus were endemics of the main islands, while the two extinct species of the genus
Nestor were found at the nearby oceanic islands like
Chatham Island of New Zealand, and
Norfolk Island and
Phillip Island of
Australia. The modern common species names,
Kea,
Kākā and
Kākāpō, are the same as the original
Māori names.
The
Norfolk Kaka and the
Chatham Kaka have become extinct in recent times,
while the extinct species of the genus
Nelepsittacus
have been extinct for 16 million years. All extant species, the Kākāpō,
Kea, and the two subspecies of the Kākā, are threatened.
Human activity caused the two extinctions and the decline of the other three species. Settlers introduced
invasive species, such as
pigs and
possums,
which eat the eggs of ground nesting birds, and additional declines
have been caused by hunting for food, killing as agricultural pests,
habitat loss, and introduced
wasps.
The family diverged from the other parrots around 82 million years ago when New Zealand broke off from
Gondwana, while the ancestors of the genera
Nestor and
Strigops diverged from each other between 60 and 80 million years ago.
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