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What the sources say

CockatielNymphicus hollandicus

Every figure, record and mechanism on the Cockatiel profile was written from a source, and this is the working table behind it: 48 claims checked word for word against these sources. The left column is what the page says. The right column is the source's own words, copied, not paraphrased; a ... marks a cut and[brackets] an insertion. Open any source and check it yourself.

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Source
01

The IUCN Red List of Threatened Species 2018

Nymphicus hollandicus. The IUCN Red List of Threatened Species 2018: e.T22684828A132056250.

The page saysLeast Concern
The source saysIUCN Red List category: Least Concern (LC).Note: stats.conservationStatus
The page saysThe IUCN Red List, in its 2018 edition, rates the species Least Concern.
The source saysIUCN Red List category: Least Concern (LC).Note: 2018 is the Red List edition named in the cited record's title (2018-2), not necessarily the assessment date

Source
02

Seki 2021

Seki (2021). Cockatiels sing human music in synchrony with a playback of the melody. PLOS ONE.

The page saysA small crested parrot from Australia's open country that can sing a human melody in near-perfect sync.
The source saysThis means cockatiels have a remarkable ability for flexible vocal control similar to what is seen in human singing.Note: tagline; small and open country from biab claims; sync claim below
The page saysSings along with a human melody, nearly perfectly in unison
The source saystwo out of these three birds spontaneously joined in singing during an ongoing melody, so that the singing by the bird and the whistling by the human were nearly perfectly synchronousNote: stats.superpower
The page saysSinging in unison is several singers producing one acoustic pattern in synchrony
The source sayssing in unison ( i . e ., multiple individuals singing a single acoustic pattern in synchrony
The page saysstudies showing it in non-human animals are quite rare
The source saysstudies demonstrating singing in unison or, monophony (as opposed to simply singing at the same time) by non-human animals are quite rare
The page saysCockatiels managed it in a study published in 2021.
The source saysTwo out of these three birds spontaneously joined in singing during an ongoing melodyNote: two of three birds; publication year from the reference
The page saysTwo of them then joined in while the whistling was already running, and bird and human were nearly perfectly synchronous.
The source saystwo out of these three birds spontaneously joined in singing during an ongoing melody, so that the singing by the bird and the whistling by the human were nearly perfectly synchronous
The page saysWhen a recording of the melody was played after a bird had started singing, the birds changed the length of the pause in their own song, and the later the playback came, the longer the delay.
The source saysthe birds kept singing after the playback sounds were presented. The birds changed the pause duration of their own song ... The duration of Y was longer when X was longer
The page saysTwo cockatiels joined a human whistler mid-melody and sang nearly perfectly in sync.
The source saystwo out of these three birds spontaneously joined in singing during an ongoing melody, so that the singing by the bird and the whistling by the human were nearly perfectly synchronous
The page saysThree hand-raised birds learned a whistled melody
The source saysThree hand-raised cockatiels were exposed to a musical melody of human whistling produced by an experimenter. All the birds learned to sing the melody.
The page saysmelody made of two halves of 11 notes each, separated by a long pause
The source saysthe first half (consisting of 11 notes) and the second half (consisting of 11 notes) separated by a long pause
The page saysThe trick is timing.
The source saysThese results indicate that the birds actively adjusted their vocal timing to the playback sound.
The page saysa whistled melody is what three hand-raised cockatiels learned in one study
The source saysThree hand-raised cockatiels were exposed to a musical melody of human whistling produced by an experimenter. All the birds learned to sing the melody.Note: vibe.reason
The page saysTwo of them then joined in while a human was already whistling it, and bird and human were nearly perfectly synchronous
The source saystwo out of these three birds spontaneously joined in singing during an ongoing melody, so that the singing by the bird and the whistling by the human were nearly perfectly synchronousNote: vibe.reason

Source
03

Animal Diversity Web, University of Michigan

Nymphicus hollandicus (cockatiel). Animal Diversity Web, University of Michigan.

The page saysHalf of that length is a long, pointed tail.
The source saysThis tapered tail is very long (ca. 15 cm), making up half of their length.
The page saysTheir colouring lets aerial predators overlook them easily, especially in shady areas.
The source saysTheir colorations allows them to be easily overlooked by aerial predators, especially in shady areas.Note: 'lets' paraphrases 'allows them to be'
The page saysHeld straight up, the crest shows a startled or alert bird.
The source saysThe crest is held vertically erect when the bird is startled or is alert.
The page saysAt about 45 degrees, the bird is content.
The source saysWhen content, it is generally held at roughly a 45-degree angle to the head.
The page saysFlat against the head shows an agitated one
The source saysWhen agitated or threatened, the crest is held flat against the head.
The page saysin flight it also lies flat, which reduces wind drag
The source saysDuring flight, the crest is also laid flat against the skull, reducing wind drag.
The page saysWith no strong defences, a cockatiel in danger takes off.
The source saysWith no prevalent natural defense mechanisms, cockatiels always choose flight when a threat is perceived
The page saysFlocks put many eyes on watch for predators
The source saysstay in large flocks, where many eyes can look for predators
The page saysSeeds are the main course.
The source saystheir sharp curved beaks are adapted to maximize efficiency in shucking and consuming seeds, their food of choice
The page saysthey use the tongue to rotate a seed while the upper beak strips off the shell
The source saysCockatiels use their tongues to rotate seeds as they use their upper beak to remove shells
The page saysDrinking is a quick job: one or two sips, then necks stretch up to swallow and survey the surroundings.
The source saysthey drink rapidly, usually only taking one to two sips of water, then extending their necks upwards to swallow and survey their surroundings
The page saysThey also use metabolic water and can go long stretches without a drink.
The source saysCockatiels utilize metabolic water production, and can go for long amounts of time without drinking.
The page saysabout half that length is tail
The source saysThis tapered tail is very long (ca. 15 cm), making up half of their length.
The page saysNot well. Animal Diversity Web says they cannot accurately imitate the human voice, but they can mimic melodies and sing
The source sayscockatiels are unlike some larger species of parrots in that they cannot accurately imitate the human voice, but have the ability to mimic melodies and can sing
The page saysmostly Australian birds of prey
The source saysAustralian birds of prey are the primary predators of cockatiels
The page saysThe crest works as a mood ring.
The source saysthe angle at which the crest is held is indicative of a bird’s mood
The page saysdangerLevel: Medium
The source saysCockatiels can also in extreme circumstances deliver a powerful bite from their sharp beaks and well-developed jaw muscles, which can easily pierce the skin.Note: stats.dangerLevel, can injure but rarely seriously (#1158)

Source
04

Birds in Backyards, BirdLife Australia

Cockatiel. Birds in Backyards, BirdLife Australia.

The page saysOpen country, usually near water, across mainland Australia and common in the arid inland
The source saysThe Cockatiel is widespread throughout mainland Australia ... in most types of open country, usually near water. It is common throughout its range, especially in the north and the more arid inland areas.Note: stats.habitat
The page saysGrass seeds, nuts, berries and grain
The source saysCockatiels feed on a variety of grass seeds, nuts, berries and grain.Note: stats.diet
The page saysAn adult is 30 to 33 cm long, with an average of 32 cm, and weighs about 90 g.
The source saysMinimum Size: 30cm Maximum Size: 33cm Average size: 32cm Average weight: 90g
The page saysThe plumage is mostly grey with a white wing patch, orange cheeks and a pointed crest.
The source saysIts plumage is mostly grey, paler below, with a white wing patch, orange cheeks and a distinctive pointed crest.
The page saysMales have a bright yellow face
The source saysThe male can be identified by its bright yellow forehead, face and crest.
The page saysCockatiels are widespread across mainland Australia and uncommon in Tasmania.
The source saysThe Cockatiel is widespread throughout mainland Australia, but is uncommon in Tasmania
The page saysThey live in pairs or small flocks in open country, usually near water, and are common in the arid inland.
The source saysThe Cockatiel is seen in pairs or small flocks, in most types of open country, usually near water. It is common throughout its range, especially in the north and the more arid inland areas.
The page saysThey are strongly nomadic, moving around in response to food and water.
The source saysthe Cockatiel is strongly nomadic, moving around in response to the availability of food and water
The page saysThey eat grass seeds, nuts, berries and grain
The source saysCockatiels feed on a variety of grass seeds, nuts, berries and grain.
The page saysBirds in Backyards puts adults at 30 to 33 cm long with an average weight of 90 g, and about half that length is tail.
The source saysMinimum Size: 30cm Maximum Size: 33cm Average size: 32cm Average weight: 90g
The page saysThey follow food and water. Birds in Backyards calls them strongly nomadic across their range
The source saysThroughout its range, the Cockatiel is strongly nomadic, moving around in response to the availability of food and water.
The page saysthey may breed at any time in response to suitable periods of rain, especially in the more arid regions
The source saysCockatiels may breed at any time, in response to suitable periods of rain, especially in the more arid regions.
The page saysIt is a small parrot.
The source saysIt is small in sizeNote: faq 1
The page saysweightKg: 0.09
The source saysAverage weight: 90gNote: battleStats.weightKg, typical adult (#1117)

Source
05

AnAge, Human Ageing Genomic Resources

AnAge entry for Nymphicus hollandicus. AnAge, Human Ageing Genomic Resources.

The page saysThe maximum recorded life is 35 years, from one bird in captivity.
The source saysMaximum longevity 35 years (captivity) ... One specimen lived for 35 years in captivity
The page saysThe record is 35 years, and it belongs to a single captive bird: AnAge gives that as the species' maximum longevity.
The source saysMaximum longevity 35 years (captivity) ... One specimen lived for 35 years in captivityNote: 'a single captive bird' paraphrases 'One specimen lived for 35 years in captivity'

How the table was made: a writer drafted the profile from these sources and logged each claim with its quote, a reviewer with nothing but this table checked every sentence said no more than its quote, and a script confirmed each quote appears word for word in the source. The method is in the site'sAbout page.