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Cryptic Warbler Cryptosylvicola randrianasoloi
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Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
Goodman, S. M.; Langrand, O.; Whitney, B. M. 1996. A new genus and species of passerine from the eastern rain forest of Madagascar. Ibis 138: 153-159.

Taxonomic note
Described as new to science by Goodman et al. (1996).

Distribution and population
This species was discovered in 1992 in the Maromiza Forest, close to the Réserve Spéciale d'Analamazaotra in the central area of the eastern rain forest of Madagascar (Goodman et al. 1996). It has subsequently been found to be restricted to, but relatively widespread in, the eastern part of the island from Anjanaharibe-Sud in the north to Andohahela in the south, being recorded from eight localities including six nature reserves, although it may well occur in areas to the north and south of its currently known range (Goodman et al. 1996).

Population justification
The global population size has not been quantified, but the species is described as locally common (del Hoyo et al. 2006).

Trend justification
The population is suspected to be in decline owing to ongoing habitat destruction.

The species would appear to prefer evergreen, humid rain forest between 900-2,100 m, but is found in primary forest, montane forest, along steep ridges, areas of bamboo and also in altered habitats including disturbed and degraded forest, exotic plantations next to native forest and forest fragments (Goodman et al. 1996, Morris and Hawkins 1998). In montane forest it favours areas dominated by Podocarpus, and in ridge-top sclerophyllous forest it favours areas where epiphytic moss and lichens are plentiful (Goodman et al. 1996). It inhabits the canopy and sub-canopy of trees and shrubs from 2-25 m but is found most often between 3-15 m, sally-gleaning insects from foliage, twigs and branches (Goodman et al. 1996). It has been recorded on numerous occasions in mixed species flocks (Goodman et al. 1996). The breeding season is October-December; one nest examined contained three eggs and family groups observed in November have comprised up to four individuals (Goodman et al. 1996). Records of the species in degraded and altered habitats indicate that it is tolerant of disturbance (Goodman et al. 1996).

The principal threat to the eastern humid forests is from slash-and-burn cultivation by subsistence farmers, resulting in progressively more degraded regrowth and leading eventually to bracken-covered areas or grassland (Stattersfield et al. 1998).

del Hoyo, J.; Elliott, A.; Christie, D. 2006. Handbook of the Birds of the World, vol. 11: Old World Flycatchers to Old World Warblers. Lynx Edicions, Barcelona, Spain.

Goodman, S. M.; Langrand, O.; Whitney, B. M. 1996. A new genus and species of passerine from the eastern rain forest of Madagascar. Ibis 138: 153-159.

Morris, P.; Hawkins, F. 1998. Birds of Madagascar: a photographic guide. Pica Press, Robertsbridge, UK.

Stattersfield, A. J.; Crosby, M. J.; Long, A. J.; Wege, D. C. 1998. Endemic bird areas of the world: priorities for bird conservation. BirdLife International, Cambridge, U.K.

Further web sources of information
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
Butchart, S., Ekstrom, J., Fisher, S., Harding, M.

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

Recommended citation
BirdLife International (2016) Species factsheet: Cryptosylvicola randrianasoloi. Downloaded from on 24/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 24/10/2016.

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.

Key facts
Current IUCN Red List category Least Concern
Family Sylviidae (Old World warblers)
Species name author Goodman, Langrand & Whitney, 1996
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 115,000 km2
Country endemic? Yes
Links to further information
- Additional Information on this species