Family Hornbills (Bucerotidae)

Least Concern

Eastern Long-tailed Hornbill (Horizocerus cassini)


French: Calao de Cassin German: Weißhauben-Hornvogel Spanish: Cálao crestiblanco oriental

Ortholophus Cassini


, 1903,



Hitherto considered conspecific with H albocristatus, but differs in its black vs white ear-coverts (3); white tips of primaries, tertials and greater coverts (2); lack of cream plate at base of upper mandible below nares, but a pale broad line above this area (from and including nares to as far as, in some cases, point on bill below tip of casque; possibly only in males), which is black in albocristatus (2); larger size (from published figures#R) (at least 1). Monotypic.


S Nigeria E to W Uganda, S to N Angola.

Descriptive notes

70–80 cm; male 270–399 g, female 204–238 g. Elongate, black hornbill with bushy white crest, and very long, graduated tail with white tip; this and H.... read more


No known differences from H. albocristatus.


Dense primary forest, but extends to tall gallery and secondary forest, even to adjacent deciduous... read more

Food and feeding

Mainly insects (including small ones and larvae), but also spiders, slugs, lizards, snakes, shrews, adult birds and nestlings (sometimes... read more


Little known. Lays aseasonally, in Jan–Feb, Jun–Aug and Oct–Dec in C Africa; observed food-carrying in W Uganda in Apr.... read more


Probably sedentary and territorial in most areas.

Status and conservation

Not globally threatened. Widespread and locally common, but generally considered rare and extremely local in W Uganda, at very edge of range. Secretive, and often in dense... read more

Recommended citation

del Hoyo, J., Collar, N. & Kirwan, G.M. (2019). Eastern Long-tailed Hornbill (Horizocerus cassini). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 17 July 2019).