Slaty Thrush

turdus nigriceps

Turdidae · Thrushes

Disc 2 · 2001 listed
Disc 3 · 2006 listed
Disc 1 · 2011 listed

The account

Description

21.5 cm. The male has an orange yellow bill. Legs yellow, brown or grayish. Eye ring yellow. Upperparts dark gray with black head. The white throat is streaked blackish. Breast and sides of abdomen light grayish. Belly and crissum white.

The female is greenish-brown on the back, with a brown head and brownish breast. (Turdus albicollis is larger and has rufous on flanks).

In the juvenile the upperparts are olivaceous-brown streaked light buff; the underparts are buff-white barred blackish-brown. Bill dark. Legs brown (¹⁴³).

Male Disc 3 · 2006
Female Disc 3 · 2006
Juvenile Disc 3 · 2006

Each plate is labelled with the disc's own caption.

Where it was recorded

The discs' own checklists select Slaty Thrush at 4 localities.

Historical checklist localities on the disc's own area map — the red dots the original program drew, placed by its recovered projection. Not a range map: it shows the places whose checklists record the bird, nothing more.

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.

Voice

Call a 'tsuk' and a high metallic single whistle. The song is a sequence of short strophes consisting of doubled or tripled thin metallic whistles of a tinkling quality delivered in intervals of varying lengths.

Behavior

Shy. Seeks out fruit trees; prefers subcanopy of wooded border situations and is therefore often difficult to see. Also forages quietly on the ground scratching and turning over fallen leaves like other thrushes.

Breeding

Ridgely and Tudor (¹³³) state that this thrush does only breed in Southern Estado São Paulo and from there on southward. They think that individuals recorded north of southern Estado São Paulo are winter migrants. In contrast, Clement (¹⁴³) includes the Serra Mantiqueira and Serra dos Orgãos in the breeding range. Willis and Oniki (¹¹⁹) also state that this species breeds in the mountains of the Northeast. Most likely individuals that sing in October / November in the Serra Mantiqueira, breed there. Supposedly breeds in November-December (¹⁴²).

Habitat and status

In Rio Grande do Sul humid and Araucaria riverine forest, also gardens with tall trees, (¹³³), parks and plantation. Regular in the Serra Mantiqueira and Serra dos Orgãos in forest.

Distribution

Southern mountainous part of Estado São Paulo,Itatiaia National Park in the Serra Mantiqueira, Serra dos Orgãos. In winter found at many inland locations, orchards, e.g. Itapetininga, Piquete, Campinas, Rio Claro (¹¹⁹). From sea level to about 1800 meters in the serras.

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

Song, January 22, 1979, Fazenda da Zamoreira, RG. Recorded by W. Belton. LNS Catalogue#20068.
Song , November 1980, RG. Recorded by T.A. Parker, Jr. LNS Catalogue # 23767.
Song, calls. November 1980. RG. Recorded by T.A. Parker. LNS Catalogue # 23769.
Song, November 21, 1971. Morro Pelado, 5 km SE of Canela, RG. Recorded by W. Belton. LNS Catalogue # 20096.

Recording files on the disc

6159.mp3 Song, January 22, 1979, Fazenda da Zamoreira, RG. Recorded by W. Belton. LNS Catalogue#20068.
8501.mp3 Song , November 1980, RG. Recorded by T.A. Parker, Jr. LNS Catalogue # 23767.
9836.mp3 Song, calls. November 1980. RG. Recorded by T.A. Parker. LNS Catalogue # 23769.
1916.mp3 Song, November 21, 1971. Morro Pelado, 5 km SE of Canela, RG. Recorded by W. Belton. LNS Catalogue # 20096.

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: breeding. The complete earlier text is shown beneath each truncated section.

Description Disc 1 · 2011

The female is greenish-brown on the back, with a brown head and brownish breast. (Turdus albicollis is larger and has rufous on flanks).

In the juvenile the upperparts are olivaceous-brown streaked light buff; the underparts are buff-white barred blackish-brown. Bill dark. Legs brown (¹⁴³).

Voice Disc 1 · 2011

Behavior Disc 1 · 2011

Breeding Disc 1 · 2011

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 (42 bytes lost in 2011)

Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.

Habitat and status Disc 1 · 2011