||Bycanistes cylindricus (Temminck, 1824)
Ceratogymna cylindricus ssp. cylindricus (Temminck, 1824) — Sibley and Monroe (1990, 1993)
Ceratogymna cylindricus ssp. cylindricus (Temminck, 1824) — Collar et al. (1994)
Ceratogymna cylindricus ssp. cylindricus (Temminck, 1824) — BirdLife International (2000)
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
||60-70 cm. Large hornbill with pale yellow bill and casque, black head (with reddish tinged cheeks in subspecies cylindricus), crest, back and upper underparts, contrasting with mostly white remiges, and lower underparts; tail white with black band. Female has smaller, back bill and casque.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Dowsett-Lemaire, F., Hall, P., Lindsell, J., Rainey, H. & Klop, E.
||O'Brien, A., Robertson, P., Shutes, S., Starkey, M., Taylor, J. & Westrip, J.
This species is listed as Vulnerable because it is suspected to be undergoing a rapid population decline owing to the impacts of habitat destruction and degradation, and hunting pressure.
|Previously published Red List assessments:|
- 2012 – Vulnerable (VU)
- 2008 – Near Threatened (NT)
- 2004 – Near Threatened (NT)
- 2000 – Lower Risk/near threatened (LR/nt)
- 1994 – Lower Risk/near threatened (LR/nt)
- 1988 – Lower Risk/least concern (LR/lc)
|Range Description:||Bycanistes cylindricus is restricted to the Upper Guinea forests of West Africa, where it is found in southern Guinea, Sierra Leone (including Loma Mountains, Western Area Peninsula Forest, Kangri Hills and Gola Forest [Okoni-Williams 2001]), Liberia, southern Côte d'Ivoire (where it remains abundant in Taï National Park and periphery habitat [Gartshore et al. 1995, H. Rainey in litt. 2007]), south-west Ghana (where recently observed only once during surveys of Draw River, Boi-Tano and Krokasua Foret Reserves [H. Rainey in litt. 2007]) and Togo (Kemp 1995; although this single record may be best considered unconfirmed [F. Dowsett-Lemaire in litt. 2012]). Its local status varies from uncommon to common (Nash 1990a, Gartshore et al. 1995, Gatter 1997). Recent observations suggest that the species is in rapid decline. It has been extirpated from Bia National Park (NP) in Ghana, where there have been no records since 1991 (Dowsett-Lemaire and Dowsett 2011). Several hunters interviewed by Dowsett-Lemaire and Dowsett (2009) in Ghana have said that B. cylindricus has become rare or difficult to find and the species may now be extinct at Fure Headwaters. It may also have disappeared from Opro River Forest Reserve (FR) (Dowsett-Lemaire and Dowsett 2010). Surveys at three forest reserves in Ghana (Draw River, Bio-Tano and Krokosua) in 2003 suggested that hornbills were in decline owing to habitat fragmentation and hunting (H. Rainey in litt. 2011). Observations of hornbill abundance in the forests of West Africa should be interpreted with regard to these species' movements, probably related to fruit abundance (e.g. H. Rainey in litt. 2011). |
Côte d'Ivoire; Ghana; Guinea; Liberia; Sierra Leone; Togo
|♦ Continuing decline in area of occupancy (AOO):||Yes|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||556000|
|♦ Continuing decline in extent of occurrence (EOO):||Yes||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Continuing decline in number of locations:||Yes|
|♦ Extreme fluctuations in the number of locations:||No|
|♦ Upper elevation limit (metres):||4054|
|Range Map:||Click here to open the map viewer and explore range.|
The species is threatened by the destruction and fragmentation of forest throughout its range (H. Rainey in litt. 1999, del Hoyo et al. 2001). This species is often the first large hornbill to disappear following selective logging (Gatter 1997). Although hornbills can travel many kilometres in a single day in search of fruiting trees, the increasing fragmentation of the Upper Guinea forest is likely to have affected populations, particularly as fragmentation is on-going and large fragments are becoming increasingly isolated (H. Rainey in litt. 2011). Forest is being lost in some protected areas, for example most forest has now been lost from Déré Foret Classée in Guinea (H. Rainey in litt. 2012). Deforestation in the region is driven by logging for timber, agricultural expansion and development, with some of the highest pressures on forest habitats occurring in Liberia (H. Rainey in litt. 2011), where there are plans to convert large areas of primary forest to oil-palm plantations (F. Dowsett-Lemaire in litt. 2012). Much forest in Opro River FR, Ghana, has been replaced with teak plantations, whilst forest at Amama Shelterbelt FR has been cleared for gardens and plantations (F. Dowsett-Lemaire in litt. 2012). Hunting is a significant threat both within and outside protected areas (H. Rainey in litt. 1999, 2011; F. Dowsett-Lemaire in litt. 2012). Hunting pressure has led to its extirpation from Bia National Park (NP), where there have been no records since 1991 (Dowsett-Lemaire and Dowsett 2009, 2011), although it persists at a number of other sites, including small numbers at Atewa Range FR and Tano Ofin FR, despite high hunting pressure at these locations (Dowsett-Lemaire and Dowsett 2009).