Canebrake Groundcreeper

clibanornis dendrocolaptoides

Furnariidae,Synallaxinae · Spinetails, Castaneros

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

The account

Description

8.3" , Chestnut crown with somewhat elongated feathers. Lores dark brown. Ear coverts rufous. An indistinct lighter superciliary. Above rufous-brown , more russet on the upper tail coverts and a rufous tail. Throat white with the feathers distinctly tipped dark brown at the base and sides of the throat (most abundant on the sides). Breast and center of abdomen whitish, sides of chest with a rufous-brown wash turning to ochraceous-brown on the sides of belly and under tail coverts.

The immature plumage lacks the dark brown tips on the feathers on the sides of the throat and the throat is more buffy, less white. (⁴¹)

The disc records this picture against the bird without a caption. Disc 3 · 2006

Where it was recorded

The discs' own checklists select Canebrake Groundcreeper at 1 locality.

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.

Boraceia BOSB

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

'Tchit tchit'-staccato sequences delivered with varying speed were recorded by Belton(Cut #1). Duets have been recorded by John Wall (⁴²).

Behavior

In pairs, secretive and difficult to see (⁴³).

Habitat and status

Rare. Low in thickets of gallery forests, reported from the vicinity of streams, dense secondary forest, dense scrub at the interface between deciduous and Araucaria forest, bamboo thickets in gullies. It seems that the predominant reason for its rarity is habitat destruction, especially the clearing of damp thickets along streams and rivulets (¹⁰³).

Distribution

From Estado São Paulo southward. Reported from Boraceia Forest Reserve (¹¹). To 800 meters (⁴⁴).

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

Calls, song. Cornell Cat#19213. Nonoai, Nonoai Forest Reserve, Rio Grande do Sul, 11/19/73. Clear. Recording by William Belton.

Recording files on the disc

7353.wav Calls, song. Cornell Cat#19213. Nonoai, Nonoai Forest Reserve, Rio Grande do Sul, 11/19/73. Clear. Recording by William Belton.

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

The 2011 Disc 1 revision both edited this account and truncated part of it at exactly 512 bytes (a 2011 mastering defect).

Truncated sections in the 2011 revision: description. The complete earlier text is shown beneath each truncated section.

Sections with genuine 2011 edits (vs the Disc 3 release): habitat_status.

Description Disc 1 · 2011

The immature plumage lac

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 (113 bytes lost in 2011)

The immature plumage lacks the dark brown tips on the feathers on the sides of the throat and the throat is more buffy, less white. (⁴¹)

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

'Tchit tchit'-staccato sequences delivered with varying speed were recorded by Belton(Cut #1). Duets have been recorded by John Wall (⁴²).

Behavior Disc 1 · 2011

In pairs, secretive and difficult to see (⁴³).

Habitat and status Disc 1 · 2011

Rare. Low in thickets of gallery forests, dense secondary forest, dense scrub at the interface between deciduous and Araucaria forest, bamboo thickets in gullies. It seems that the predominant reason for its rarity is habitat destruction, especially the clearing of damp thickets along streams and rivulets (¹⁰³).

Distribution Disc 1 · 2011