• Summary
• Text account
• Data table and detailed info
• Distribution map
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• Reference and further resources

Justification of Red List category
This species has a large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence under 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). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (under 10,000 mature individuals with a continuing decline estimated to be over 10% in ten years or three generations, or with a specified population structure). 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 (over 30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but the species is described as locally common (Clement et al. 1999). The species's population is assumed to be in decline, owing to the declining extent and quality of its habitat.

Trend justification
The species's population is assumed to be in decline, owing to the declining extent and quality of its habitat.

Estrilda thomensis was originally described in error as being from the island of São Tomé but is in fact restricted to south-western Angola (Namibe Province, north and east to south-western Huila Province and north to Fazenda do Cuito in Huambo) (Dean 2000) and extreme north-western Namibia (up to 50 km from the lower Cunene or Kunene River) (Harrison et al. 1997, C. Hines in litt. 2005). Overall, it has a large Extent of Occurrence of 95,400 km². It is rare in Namibia, probably numbering fewer than 2,000 birds in total (Simmons and Brown 2006).

In Angola, it is locally common to frequent in thornbush, scrub, open mopane woodland and riverine Acacia woodland from 200-500 m (Clement et al. 1993, Dean 2000). In Namibia, it is restricted to mopane and riverine woodlands of the Cunene River system and its drainages, being rare in Acacia woodland (Fry and Keith 2004). It is apparently resident in Angola, but subject to substantial local movements in Namibia after rain. It feeds on grass seeds and other small seeds, flowers, insects and possibly nectar. Nest-building in Namibia has been noted in late November to December, after the first rains. Its nest in captivity has been described as a large ball of grass and coconut fibres with a narrow, down-sloping entrance tube. Two clutches of 3-4 eggs may be laid. The incubation period is 12.5-14 days, followed by a fledging period of 17-21 days (Fry and Keith 2004).

The species's habitat is generally threatened by habitat degradation caused by overgrazing and trampling by cattle and goats (C. Hines in litt. 2005, Simmons and Brown 2006), and clearance (often using fire) for subsistence agriculture. More pastoral agriculturalists are likely to be attracted by the permanent water that the proposed dam would produce (Simmons and Brown 2006). Increases in human inhabitation at springs and small tributaries south of Cunene River, with associated wood-cutting, over-grazing and over-utilisation of water, is seen by some as a greater threat than direct habitat destruction by the dam (Fry and Keith 2004). The proposed development of a hydroelectric plant on the Cunene River at Epupa Falls threatened the species's survival in Namibia; covering around half of the species's habitat in the country and - by altering river dynamics - probably changing insect biodiversity relied on by the species during feeding of young (Harrison et al. 1997, Simmons and Brown 2006). The project would also have removed habitat on the Angolan side (R. Simmons in litt. 1999). Opposition to development at this site resulted the original proposal being abandoned in 2008 and led to a new proposal to dam the river c40km downstream of Epupa Falls at Baynes, which was also opposed by local people and was still undergoing consultation in late 2011 (Anon 2011).

Conservation Actions Underway
In Angola the species occurs in Iona National Park and possibly also Chimalavera Regional Nature Park, as well as in proposed protected areas at Chongoroi and Tundavala (Dean 2001).

Conservation Actions Proposed
Conduct surveys to obtain an estimate of the population size and locate nesting areas (Simmons and Brown 2006). Study the species's breeding ecology (Simmons and Brown 2006). Monitor population trends through regular surveys. Monitor rates of habitat loss and degradation within its range. Assess the impact on the species of the proposed hydroelectric dam. Lobby for the proposed hydroelectric development to be abandoned, and harness local support in the process.

Text account compilers
Rutherford, C.A.

Contributors
Hines, C. & Simmons, R.

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Recommended citation
BirdLife International (2024) Species factsheet: Cinderella Waxbill Glaucestrilda thomensis. Downloaded from https://datazone.birdlife.org/species/factsheet/cinderella-waxbill-glaucestrilda-thomensis on 22/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/11/2024.