||Ferminia cerverai Barbour, 1926
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
||16 cm. Medium-sized, brown wren. Brown, striped black, except for greyish underparts. Long tail, bill and legs. Similar spp. House Wren Troglodytes aedon is smaller, all brown and does not inhabit sawgrass. Voice High-pitched, loud and musical warble preceded by guttural note, given in series of three or four phrases. Also harsh and chipping notes. Female song is weaker and shorter.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Isherwood, I., Mahood, S., Pople, R., Sharpe, C.J., Wege, D., Wheatley, H.
A recent survey suggests that this species might be more common than previously feared. However, it is classified as Endangered because it has a very small range and presumably population, which are confined to one area and continue to decline in response to habitat loss (Collar et al. 1992).
|Previously published Red List assessments:|
- 2016 – Endangered (EN)
- 2012 – Endangered (EN)
- 2008 – Endangered (EN)
- 2004 – Endangered (EN)
- 2000 – Endangered (EN)
- 1996 – Critically Endangered (CR)
- 1994 – Critically Endangered (CR)
- 1988 – Threatened (T)
|Population:||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: There are no new data; however, the species is suspected to be declining at a rate of 1-9% over ten years, owing mainly to habitat degradation.
|Current Population Trend:||Decreasing|
|♦ Number of mature individuals:||600-1700||♦ Continuing decline of mature individuals:||Yes|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||Yes|
|♦ No. of subpopulations:||1||♦ Continuing decline in subpopulations:||Unknown|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||Yes|
|♦ No. of individuals in largest subpopulation:||100|