Post by Eaglehawk on Aug 7, 2019 8:11:45 GMT
Heracles inexpectatus
Weighing in at 7 kilograms, Heracles inexpectatus is the first giant parrot discovered anywhere in the world. (Supplied: Dr Brian Choo/Flinders University)
Temporal range: Miocene
Scientific classification
Genus: †Heracles
Species: †Heracles inexpectatus Worthy et al., 2019
Heracles inexpectatus is an extinct, giant New Zealand parrot that lived during the early Miocene. The species was described from fossils discovered in 2008 at Saint Bathans, Otago, New Zealand. It is believed that the species stood up to 1 metre tall and weighed approximately 7 kg. It was closest related to the modern Kakapo, was flightless, and fed on fruit, nuts, and berries. It shared its place with 5 other species of parrot in the genus Nelepsittacus, as well as several other species of bird in the St Bathans Fauna. It is the largest parrot known to have existed.
Fossils of metre-tall giant parrot dubbed Heracles found in New Zealand
ABC Science
By Genelle Weule
Updated about 7 hours ago
First posted about 8 hours ago
Key points
New Zealand is home to a bunch of feisty and unusual parrots, but none of them would have been a match for Heracles.
Around 19 million years ago, the screeches of this largest ever parrot would have rung out through the sub-tropical forests of what is now the South Island.
Dubbed Heracles inexpectatus after the Greek god of strength, it was a whopper of a bird.
Judging from its fossilised drumsticks, the parrot would have stood about 1 metre tall and weighed up to 7 kilograms, a team of palaeontologists report in the journal Biology Letters.
"It was totally unexpected to find a giant parrot," said palaeontologist and lead author Trevor Worthy of Flinders University in Adelaide.
The giant parrot Heracles stood about 1 metre tall (Supplied: Professor Paul Scofield, Canterbury Museum)
New Zealand is known to have had supersized birds such as moa, geese, cranes, eagles, and other islands like Fiji were home to giant pigeons.
But this is the first giant parrot to be discovered anywhere in the world.
The largest parrot living today is the kakapo (Strigops habroptilus), a critically endangered flightless nocturnal bird that also lives in New Zealand.
"The kakapo is typically no more than 3kg and that's considered extraordinary in the parrot world.
"So we're talking about something more than double of that."
Lush forests and abundant birdlife
Dr Worthy excavated two bird leg bones in 2008 at a fossil site near St Bathans in the Otago region, which he's been visiting for the past two decades.
The fossil site is New Zealand's only window into life on land as it went through rapid geological upheaval after the dinosaurs died out 65 million years ago up until about 1 million years ago.
Between 16 and 19 million years old, the fossil site documents a brief snapshot of time known as the early Miocene.
"St Bathans fauna is the only site that tells us about the birds and the bats and things that were living on the land in that whole long period of time," Dr Worthy said.
During the early Miocene, the climate was similar to north Queensland.
The area was a freshwater lake surrounded by lush forests filled with various species of fruiting trees, casuarinas, palms and cycads. And it was teeming with birdlife.
"We already know there were about 40 other birds in the St Bathans fauna," Dr Worthy said.
These include several species of moa, ducks, geese, parrots, pigeons, seagulls, little songbirds and a tiny kiwi.
"We have now got about 7,000 bird bones so this [latest discovery] is a very rare species in the fauna."
Bones reveal telltale marks of a parrot
Dr Worthy and his colleagues compared the two leg bones, each known as a tibiotarsus, to a range of bird species to pin down their owner.
"If you're familiar with chickens ... the long leg bones are the drumsticks."
Even though the ends were missing, the shape of the bone shaft and position of scars marking where tendons were attached indicated the bones were from a parrot.
The leg bones of Heracles (brown) are a similar shape to, but much larger than, those of the kakapo (white) (Supplied: Trevor Worthy)
Its relationship to living parrots is still unclear but it is likely to have belonged to an ancient group of parrots unique to New Zealand that includes the kakapo as well as the kea (Nestor notabilis), and the kaka (Nestor meridionalis).
By comparing the leg bones of those of the kakapo they were able to work out the creature's size and mass.
Heracles' heftiness suggests that like the kakapo, it was likely to be a land dweller that used its beak to climb trees.
"The kakapo is totally flightless but it can still climb to the top of trees and climb back down," Dr Worthy said.
"While [Heracles] probably spent much of its time on the ground it's quite likely it could have clambered up trees to grab things."
"At 7kg it's not much bigger than a koala, and they can go out to the end of branches."
The critically endangered kakapo is the biggest parrot alive today. (Flickr: Department of Conservation)
Once were giants
The sheer size of the new discovery is remarkable, said avian palaeontologist Jacqueline Nguyen of the Australian Museum's Research Institute.
"I'm excited to learn that even after 20 years of excavation at St Bathans there are still lots of new species and very interesting birds coming out of this site," said Dr Nguyen, who was not involved with this discovery but has previously worked with this team.
Giantism in New Zealand's bird population likely evolved due to a lack of competition.
"New Zealand is the land of birds, there are not many mammals present so it's possible these birds have taken advantage of these empty ecological niches taken up by mammals and they flourished and became larger," Dr Nguyen said.
But, she said, this discovery was unexpected because giantism had never been seen before in parrots.
"We know that giantism has happened in other bird groups, but there doesn't seem to be a clear pattern as to which types of birds will become gigantic on islands."
Hopefully, she said, the researchers will be able to get a better idea of the giant bird's relationships to living parrots when they find more fossil material.
That might take some time, but Dr Worthy is hopeful.
"It's all about serendipity," he said.
"A while ago I named one of the pigeons on a single bone we had, and then eight years later we got another bone of it.
"It happens, it just depends upon how long you are willing to wait."
www.abc.net.au/news/science/2019-08-07/fossils-of-giant-parrot-heracles-found-in-new-zealand/11384612
Journal Reference:
Worthy, Trevor H.; Hand, Suzanne J.; Archer, Michael; Schofield, R. Paul; De Pietri, Vanesa L. (2019). "Evidence for a giant parrot from the early Miocene of New Zealand". Biology Letters. doi:10.1098/rsbl.2019.0467
Abstract
Insular avifaunas have repeatedly spawned evolutionary novelties in the form of unusually large, often flightless species. We report fossils from the Early Miocene St Bathans Fauna of New Zealand that attests to the former existence of a giant psittaciform, which is described as a new genus and species. The fossils are two incomplete tibiotarsi from a bird with an estimated mass of 7 kg, double that of the heaviest known parrot, the kakapo Strigops habroptila. These psittaciform fossils show that parrots join the growing group of avian taxa prone to giantism in insular species, currently restricted to palaeognaths, anatids, sylviornithids, columbids, aptornithids, ciconiids, tytonids, falconids and accipitrids.
royalsocietypublishing.org/doi/10.1098/rsbl.2019.0467
Weighing in at 7 kilograms, Heracles inexpectatus is the first giant parrot discovered anywhere in the world. (Supplied: Dr Brian Choo/Flinders University)
Temporal range: Miocene
Scientific classification
Genus: †Heracles
Species: †Heracles inexpectatus Worthy et al., 2019
Heracles inexpectatus is an extinct, giant New Zealand parrot that lived during the early Miocene. The species was described from fossils discovered in 2008 at Saint Bathans, Otago, New Zealand. It is believed that the species stood up to 1 metre tall and weighed approximately 7 kg. It was closest related to the modern Kakapo, was flightless, and fed on fruit, nuts, and berries. It shared its place with 5 other species of parrot in the genus Nelepsittacus, as well as several other species of bird in the St Bathans Fauna. It is the largest parrot known to have existed.
Fossils of metre-tall giant parrot dubbed Heracles found in New Zealand
ABC Science
By Genelle Weule
Updated about 7 hours ago
First posted about 8 hours ago
Key points
New Zealand is home to a bunch of feisty and unusual parrots, but none of them would have been a match for Heracles.
Around 19 million years ago, the screeches of this largest ever parrot would have rung out through the sub-tropical forests of what is now the South Island.
Dubbed Heracles inexpectatus after the Greek god of strength, it was a whopper of a bird.
Judging from its fossilised drumsticks, the parrot would have stood about 1 metre tall and weighed up to 7 kilograms, a team of palaeontologists report in the journal Biology Letters.
"It was totally unexpected to find a giant parrot," said palaeontologist and lead author Trevor Worthy of Flinders University in Adelaide.
The giant parrot Heracles stood about 1 metre tall (Supplied: Professor Paul Scofield, Canterbury Museum)
New Zealand is known to have had supersized birds such as moa, geese, cranes, eagles, and other islands like Fiji were home to giant pigeons.
But this is the first giant parrot to be discovered anywhere in the world.
The largest parrot living today is the kakapo (Strigops habroptilus), a critically endangered flightless nocturnal bird that also lives in New Zealand.
"The kakapo is typically no more than 3kg and that's considered extraordinary in the parrot world.
"So we're talking about something more than double of that."
Lush forests and abundant birdlife
Dr Worthy excavated two bird leg bones in 2008 at a fossil site near St Bathans in the Otago region, which he's been visiting for the past two decades.
The fossil site is New Zealand's only window into life on land as it went through rapid geological upheaval after the dinosaurs died out 65 million years ago up until about 1 million years ago.
Between 16 and 19 million years old, the fossil site documents a brief snapshot of time known as the early Miocene.
"St Bathans fauna is the only site that tells us about the birds and the bats and things that were living on the land in that whole long period of time," Dr Worthy said.
During the early Miocene, the climate was similar to north Queensland.
The area was a freshwater lake surrounded by lush forests filled with various species of fruiting trees, casuarinas, palms and cycads. And it was teeming with birdlife.
"We already know there were about 40 other birds in the St Bathans fauna," Dr Worthy said.
These include several species of moa, ducks, geese, parrots, pigeons, seagulls, little songbirds and a tiny kiwi.
"We have now got about 7,000 bird bones so this [latest discovery] is a very rare species in the fauna."
Bones reveal telltale marks of a parrot
Dr Worthy and his colleagues compared the two leg bones, each known as a tibiotarsus, to a range of bird species to pin down their owner.
"If you're familiar with chickens ... the long leg bones are the drumsticks."
Even though the ends were missing, the shape of the bone shaft and position of scars marking where tendons were attached indicated the bones were from a parrot.
The leg bones of Heracles (brown) are a similar shape to, but much larger than, those of the kakapo (white) (Supplied: Trevor Worthy)
Its relationship to living parrots is still unclear but it is likely to have belonged to an ancient group of parrots unique to New Zealand that includes the kakapo as well as the kea (Nestor notabilis), and the kaka (Nestor meridionalis).
By comparing the leg bones of those of the kakapo they were able to work out the creature's size and mass.
Heracles' heftiness suggests that like the kakapo, it was likely to be a land dweller that used its beak to climb trees.
"The kakapo is totally flightless but it can still climb to the top of trees and climb back down," Dr Worthy said.
"While [Heracles] probably spent much of its time on the ground it's quite likely it could have clambered up trees to grab things."
"At 7kg it's not much bigger than a koala, and they can go out to the end of branches."
The critically endangered kakapo is the biggest parrot alive today. (Flickr: Department of Conservation)
Once were giants
The sheer size of the new discovery is remarkable, said avian palaeontologist Jacqueline Nguyen of the Australian Museum's Research Institute.
"I'm excited to learn that even after 20 years of excavation at St Bathans there are still lots of new species and very interesting birds coming out of this site," said Dr Nguyen, who was not involved with this discovery but has previously worked with this team.
Giantism in New Zealand's bird population likely evolved due to a lack of competition.
"New Zealand is the land of birds, there are not many mammals present so it's possible these birds have taken advantage of these empty ecological niches taken up by mammals and they flourished and became larger," Dr Nguyen said.
But, she said, this discovery was unexpected because giantism had never been seen before in parrots.
"We know that giantism has happened in other bird groups, but there doesn't seem to be a clear pattern as to which types of birds will become gigantic on islands."
Hopefully, she said, the researchers will be able to get a better idea of the giant bird's relationships to living parrots when they find more fossil material.
That might take some time, but Dr Worthy is hopeful.
"It's all about serendipity," he said.
"A while ago I named one of the pigeons on a single bone we had, and then eight years later we got another bone of it.
"It happens, it just depends upon how long you are willing to wait."
www.abc.net.au/news/science/2019-08-07/fossils-of-giant-parrot-heracles-found-in-new-zealand/11384612
Journal Reference:
Worthy, Trevor H.; Hand, Suzanne J.; Archer, Michael; Schofield, R. Paul; De Pietri, Vanesa L. (2019). "Evidence for a giant parrot from the early Miocene of New Zealand". Biology Letters. doi:10.1098/rsbl.2019.0467
Abstract
Insular avifaunas have repeatedly spawned evolutionary novelties in the form of unusually large, often flightless species. We report fossils from the Early Miocene St Bathans Fauna of New Zealand that attests to the former existence of a giant psittaciform, which is described as a new genus and species. The fossils are two incomplete tibiotarsi from a bird with an estimated mass of 7 kg, double that of the heaviest known parrot, the kakapo Strigops habroptila. These psittaciform fossils show that parrots join the growing group of avian taxa prone to giantism in insular species, currently restricted to palaeognaths, anatids, sylviornithids, columbids, aptornithids, ciconiids, tytonids, falconids and accipitrids.
royalsocietypublishing.org/doi/10.1098/rsbl.2019.0467
