Von der Decken's hornbill (''Tockus deckeni'') is a

hornbill Hornbills are birds found in tropical and subtropical Africa, Asia and Melanesia of the family Bucerotidae. They are characterized by a long, down-curved bill which is frequently brightly coloured and sometimes has a horny casque on the upper ...

found in

East Africa East Africa, also known as Eastern Africa or the East of Africa, is a region at the eastern edge of the Africa, African continent, distinguished by its unique geographical, historical, and cultural landscape. Defined in varying scopes, the regi ...

, especially to the east of the

East African Rift The East African Rift (EAR) or East African Rift System (EARS) is an active continental rift zone in East Africa. The EAR began developing around the onset of the Miocene, 22–25 million years ago. It was formerly considered to be part of a l ...

, from

Ethiopia Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...

south to

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

. It is found mainly in thorn scrub and similar arid habitats.

Jackson's hornbill Jackson's hornbill (''Tockus jacksoni'') is a species of hornbill in the family Bucerotidae. It is only found in North West Kenya and North East Uganda. Except for the dense white spots on the wing-coverts, it resembles, and is often considered ...

is often treated as a

subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...

of it. It was named after the German explorer Baron

Karl Klaus von der Decken Baron Karl Klaus (Carl Claus) von der Decken (born 8 August 1833 in Kotzen, Brandenburg, Germany; died 2 October 1865 near Bardera, Somalia) was a German explorer of eastern Africa and the first European to attempt to climb Mount Kilimanjar ...

(1833–1865).

Description

This species is a small hornbill with blackish upperparts and mainly whitish underparts and head. It has a long tail and a long curved bill which lacks a casque. It is similar to the

red-billed hornbill The red-billed hornbills are a group of hornbills found in the savannas and woodlands of sub-Saharan Africa. They are now usually Lumpers_and_splitters#Biology, split into five species, the northern red-billed hornbill (''Tockus erythrorhynchus ...

except for the bill colour and the lack of spotting on the

wing coverts A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or ''tectrices''), which cover other feathers. The coverts help to smooth airflow over the wings and tail. Ear coverts The ear coverts are small feathers behind t ...

in both male and female. The species shows

sexual dimorphism Sexual dimorphism is the condition where sexes of the same species exhibit different Morphology (biology), morphological characteristics, including characteristics not directly involved in reproduction. The condition occurs in most dioecy, di ...

; the female has a black bill, whereas the male has a red bill with a cream tip and a black cutting edge.

Breeding

During incubation, the female lays two or three white

eggs An egg is an organic vessel in which an embryo begins to develop. Egg, EGG or eggs may also refer to: Biology * Egg cell, the female reproductive cell (gamete) in oogamous organisms Food * Eggs as food Places * Egg, Austria * Egg, Switzerland ...

in a tree hole, which is blocked off with a cement made of mud, droppings and fruit pulp. There is only one narrow aperture, just big enough for the male to transfer food to the mother and chicks. When the chicks and the female are too big for the nest, the mother breaks out and rebuilds the wall. Then both parents feed the chicks. Captive breeding can be achieved by providing a small barrel or hollow tree with an entrance hole tall and wide. The birds will block off the hole once the hen is ready.

Food and feeding

Von der Decken's hornbill is

omnivorous An omnivore () is an animal that regularly consumes significant quantities of both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize ...

, taking

insect Insects (from Latin ') are Hexapoda, hexapod invertebrates of the class (biology), class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (Insect morphology#Head, head, ...

s, fruit and seeds. It feeds mainly on the ground and will form flocks outside the breeding season. In captivity, Von Der Decken's hornbill will readily eat papaya, cantaloupe, blueberries, bananas, and apples. Live food such as crickets and mealworms should also be offered daily. Small rodents are readily taken but should only be offered two or three times a week.

References

{{Taxonbar, from=Q285064 Tockus Hornbills Birds of East Africa Birds described in 1869 Taxa named by Jean Cabanis