Bearded Tachuri
polystictus pectoralis
Tyrannidae,Elaeninae · Tyrannulets
- Disc 2 · 2001 listed
- Disc 3 · 2006 listed
- Disc 1 · 2011 listed
The account
Description
9 cm. A scarce tiny short-tailed flycatcher of the highly threatened campo cerrado. Indication of a crest. Above cinnamon-brown, rump lighter. Crown grayish with darker elongated feathers and a concealed white patch. White short superciliary stripe. Lower sides of head and throat streaked black and white in the male. Wings black with two buff-yellow wing bars. Below cinnamon-brown on chest, belly buff-white.
Female has a brown crown streaked blackish, the cheeks finely streaked dark brown, but otherwise lacks the black and white throat streakings.
Juveniles have reddish in the primaries, buffy wing bars and yellow undersides.
-
Male Disc 3 · 2006 -
Female Disc 3 · 2006 -
Singing male, Itirapina. Photo F. Mueller. Disc 3 · 2006
Each plate is labelled with the disc's own caption.
Where it was recorded
The discs' own checklists select Bearded Tachuri at 1 locality.
- Itirapina ITSB
How the map was made
The original program computed each red dot at display time from the locality's coordinates, using its map library and one of five base maps drawn for the screen widths of the day. That library's projection — an oblique rotation of the sphere about the map's own centre, 23.7°S 47.4°W — was read from the program and checked against the graticule the same program drew into the base maps: it reproduces every grid intersection to within about a pixel. The dots here use that projection on the 1280-pixel base map, with the coordinates the discs record. Nothing was placed by hand, no modern map data was used, and a place whose coordinate is incomplete, out of range or beyond the map's edge is listed rather than guessed.
The discs carried location maps only; none shows a distribution or range.
The account, continued
Voice
Flight song 'wee zi zi zrre' or 'zi zi zi zi zrre', described by Willis as 'tee tee tee teet' followed by an short grasshopper-like 'wing buzz' at the apex of a 20-100 meters flight to 10 meters above the ground (79). I have heard the song in cut #1 also from a perched male.
Willis says that "the song without the buzz at the end is given inside or atop a low bush before sunrise in springtime. Earlier still, in the near-dark, unseen birds circle slowly in the sky, repeating their songs and buzzes every 3 sec". Also A short 'peewee' when in small groups. Before feeding, an adult gave a faint 'chup-chup, seet-seet'.
Behavior
Singly moving low through grassland and bushes, possibly a perch gleaner.
Breeding
Nest is an open cup (86). Within Brazil this species is highly endangered.
Habitat and status
Rare and local in campo cerrado, a dry savannah grassland with high grass cover and small interspersed bushes. This type of habitat is rapidly being converted into agricultural land all over the interior of Brazil. According to Willis also wanders "through disturbed bushy pastures or abandoned fields nearby, especially in winter".
Distribution
In Estado São Paulo well known from Itirapina near Rio Claro. Might occur however closer to the coast in suitable habitat.
Decoded from the disc's own bytes. Each part is shown under the heading the disc files it under, and the wording, spelling and punctuation are the author's.
Vocalizations
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Song. Itirapina, 11/12/95. Sunny, 30°C. Open cerrado with low scrub.
Recording files on the disc
- 2365.wav Song. Itirapina, 11/12/95. Sunny, 30°C. Open cerrado with low scrub.
Across the three discs
The work was published on three discs — Disc 2 in 2001, Disc 3 in 2006 and Disc 1 in 2011. Where they differ, that is a difference between historical releases, and it is never merged away. The 2011 disc is not treated as correcting the earlier ones.
Which discs list this bird
- Disc 2 · 2001 — in this disc's bird list
- Disc 3 · 2006 — in this disc's bird list
- Disc 1 · 2011 — in this disc's bird list
How that was established
- Disc 2 · 2001
aux_nonzero;local_checklist_byte45_flag_1- Disc 3 · 2006
aux_nonzero;local_checklist_byte45_flag_1- Disc 1 · 2011
aux_nonzero;local_checklist_byte45_flag_1
The disc's own record fields that place the bird on its list: a non-empty entry in the species table, and the byte that marks it as selected on a local checklist.
The account in the Disc 1 · 2011 revision
In the 2011 Disc 1 revision, part of this account was truncated at exactly 512 bytes (a 2011 mastering defect). The earlier releases preserve the complete text.
Truncated sections in the 2011 revision: description; voice. The complete earlier text is shown beneath each truncated section.
Description Disc 1 · 2011
9 cm. A scarce tiny short-tailed flycatcher of the highly threatened campo cerrado. Indication of a crest. Above cinnamon-brown, rump lighter. Crown grayish with darker elongated feathers and a concealed white patch. White short superciliary stripe. Lower sides of head and throat streaked black and white in the male. Wings black with two buff-yellow wing bars. Below cinnamon-brown on chest, belly buff-white.
Female has a brown crown streaked blackish, the cheeks finely streaked dark brown, but otherwise l
Disc 1 (2011) text ends here — truncated at exactly 512 bytes in the 2011 mastering (historical defect, kept as recovered).
Complete earlier text — Disc 3 · 2006 (125 bytes lost in 2011)
9 cm. A scarce tiny short-tailed flycatcher of the highly threatened campo cerrado. Indication of a crest. Above cinnamon-brown, rump lighter. Crown grayish with darker elongated feathers and a concealed white patch. White short superciliary stripe. Lower sides of head and throat streaked black and white in the male. Wings black with two buff-yellow wing bars. Below cinnamon-brown on chest, belly buff-white.
Female has a brown crown streaked blackish, the cheeks finely streaked dark brown, but otherwise lacks the black and white throat streakings.
Juveniles have reddish in the primaries, buffy wing bars and yellow undersides.
Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.
Voice Disc 1 · 2011
Flight song 'wee zi zi zrre' or 'zi zi zi zi zrre', described by Willis as 'tee tee tee teet' followed by an short grasshopper-like 'wing buzz' at the apex of a 20-100 meters flight to 10 meters above the ground (79). I have heard the song in cut #1 also from a perched male.
Willis says that "the song without the buzz at the end is given inside or atop a low bush before sunrise in springtime. Earlier still, in the near-dark, unseen birds circle slowly in the sky, repeating their songs and buzzes every 3
Disc 1 (2011) text ends here — truncated at exactly 512 bytes in the 2011 mastering (historical defect, kept as recovered).
Complete earlier text — Disc 3 · 2006 (112 bytes lost in 2011)
Flight song 'wee zi zi zrre' or 'zi zi zi zi zrre', described by Willis as 'tee tee tee teet' followed by an short grasshopper-like 'wing buzz' at the apex of a 20-100 meters flight to 10 meters above the ground (79). I have heard the song in cut #1 also from a perched male.
Willis says that "the song without the buzz at the end is given inside or atop a low bush before sunrise in springtime. Earlier still, in the near-dark, unseen birds circle slowly in the sky, repeating their songs and buzzes every 3 sec". Also A short 'peewee' when in small groups. Before feeding, an adult gave a faint 'chup-chup, seet-seet'.
Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.
Behavior Disc 1 · 2011
Singly moving low through grassland and bushes, possibly a perch gleaner.
Breeding Disc 1 · 2011
Nest is an open cup (86). Within Brazil this species is highly endangered.
Habitat and status Disc 1 · 2011
Rare and local in campo cerrado, a dry savannah grassland with high grass cover and small interspersed bushes. This type of habitat is rapidly being converted into agricultural land all over the interior of Brazil. According to Willis also wanders "through disturbed bushy pastures or abandoned fields nearby, especially in winter".
Distribution Disc 1 · 2011
In Estado São Paulo well known from Itirapina near Rio Claro. Might occur however closer to the coast in suitable habitat.
The work's own taxonomy
The discs carried three parallel name schemes. All three are shown as recovered; none is a modern taxonomy and none has been updated.
| Scheme | Scientific name | English name | Family |
|---|---|---|---|
| WORLD | polystictus pectoralis | Bearded Tachuri | Tyrannidae,Elaeninae |
| CLEMENTS | polystictus pectoralis | Bearded Tachuri | Tyrannidae,Elaeninae |
| AOU_HM | polystictus pectoralis | Bearded Tachuri | Tyrannidae,Elaeninae |
Open questions about this bird
Recovered evidence that has not been settled. It is published because leaving it out would misrepresent what the discs contain.
Later listening, kept separate from the disc's own claims
content_441008 — historical_target: POLYSTICTUS PECTORALIS (historical_source)
Source details
- Identifier on this site
- seb_species_0219
- Account identifier
- seb_account_0219
- Account number on the disc
- 219
- Source edition
- CD03 / 2006 package
- Original taxonomy scheme
- WORLD
- Structure status
- heuristic; decoded_account_text and segment JSON remain authoritative