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Negros Striped-babbler Stachyris nigrorum
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Justification
This species qualifies as Endangered because it has a very small range, being known from just two mountains, where on-going forest destruction is reducing the extent, area and quality of habitat, and inevitably leading to a decline in numbers. It appears to be exceedingly rare on one of the mountains and, if there are no further records in the near future, it should be considered confined to one location and may require uplisting to Critically Endangered.

Taxonomic source(s)
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Identification
c.13 cm. Small, olive-brown and whitish babbler with moderately long, dark grey bill. Warm olive-brown upperparts, whitish underparts with relatively broad, contrasting dark streaking on flanks, ventral region suffused yellowish. Whitish eye-ring and conspicuous black "mask". Similar spp. Possibly confusable with other small passerines with streaked underparts (e.g. Muscicapa flycatchers), but distinguishable by combination of behaviour and dark mask. Voice Rather thin, high-pitched contact call notes consisting of tsip-tsip-tsip, often in trills. Hints Often encountered in groups, including mixed-species foraging flocks.

Distribution and population
Stachyris nigrorum is endemic to Negros in the Philippines, where it is known from the vicinity of Mt Talinis in the south and from Mt Canlaon in the north (Collar et al. 1999). It was also recently sighted at Mt Hapono-haponon in Mantikil, Siaton (A. Bucol in litt. 2007). It is common around Mt Talinis, where surveys in 1991 recorded 76 individuals in a day, making it the second most frequently recorded species. However, it is likely to be declining within this very restricted range. There is only one (recent) record from Mt Canlaon, despite considerable subsequent fieldwork there, casting doubt over the importance of this site to the species.

Population justification
The population is estimated to number 1,000-2,499 individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals.

Trend justification
Habitat destruction within its tiny range is thought to be on-going, suggesting that moderately rapid and continuing population declines are likely to be occurring.

Ecology
It inhabits montane forest between 950 and 1,600 m, chiefly occurring between 1,050 and 1,400 m, generally favouring the lower storey. It seems to tolerate degraded habitats, having been recorded in recently degraded forest, secondary forest and dense bushes at the forest edge and in forest opened up for agriculture. However, it appears to be limited to areas with some remaining forest cover (A. Bucol in litt. 2007).

Threats
In 1988, it was estimated that a mere 4% of Negros remained forested. Deforestation, owing to agricultural encroachment and logging activities, has reached 1,250 m on Mt Talinis, higher than any other site on Negros. In 1993, a large proportion of the forest was protected by a single guard who, in response to threats from slash-and-burn farmers, was confining his patrol work to the road up the mountain.

Conservation Actions Underway
The Mt Talinis/Twin Lakes area has been proposed for conservation funding. This area includes c.40 km2 of high-altitude forest afforded nominal protection through the Negros Geothermal Reservation. Environmental awareness campaigns have been conducted near Mt Talinis itself. The Mt Canlaon Natural Park may afford some protection if the species persists there. Conservation Actions Proposed
Regularly monitor the status of the species on Mt. Talinis, as well as Mt Hapono-haponon in Mantikil, Siaton. Urgent need to clarify the status of the species on Mt Canlaon. Research the habitat requirements of the species, and determine the extent to which secondary habitats are tolerated. Promote stricter enforcement of existing legislation to curb deforestation at higher elevations on Mt Talinis. Expand environmental education initiatives around Mt Talinis.

References
Collar, N. J.; Mallari, N. A. D.; Tabaranza, B. R. J. 1999. Threatened birds of the Philippines: the Haribon Foundation/BirdLife International Red Data Book. Bookmark, Makati City.

Further web sources of information
Alliance for Zero Extinction (AZE) species/site profile. This species has been identified as an AZE trigger due to its IUCN Red List status and limited range.

Click here for more information about the Alliance for Zero Extinction (AZE)

Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).

Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Benstead, P., Gilroy, J., Taylor, J.

Contributors
Bucol, A.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Stachyris nigrorum. Downloaded from http://www.birdlife.org on 26/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/12/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Negros striped-babbler (Stachyris nigrorum) 0

Key facts
Current IUCN Red List category Endangered
Family Timaliidae (Babblers and parrotbills)
Species name author Rand & Rabor, 1952
Population size 600-1700 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 470 km2
Country endemic? Yes
Links to further information
- Additional Information on this species