Drill (animal)

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Drill [1]
Male Drill (Mandrillus leucophaeus) (7609817756).jpg
Male at Limbe Wildlife Centre, Cameroon
Drill Mandrillus leucophaeus Junges Tierpark Hellabrunn-7.jpg
Female with infant at Tierpark Hellabrunn in Munich, Germany
CITES Appendix I (CITES) [3]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Cercopithecidae
Genus: Mandrillus
Species:
M. leucophaeus
Binomial name
Mandrillus leucophaeus
(F. Cuvier, 1807)
Subspecies

M. l. leucophaeus
M. l. poensis

Drill range map.svg
Drill range

The drill (Mandrillus leucophaeus) is a primate of the family Cercopithecidae (Old World monkeys), related to baboons and even more closely to mandrills.

Contents

Description

A skull Mandrillus leucophaeus 01 MWNH 297.jpg
A skull

The drill is a short-tailed monkey up to 70 cm (28 in) long, similar in appearance to the mandrill, but lacks the bright blue and red on the face of that species. It has high sexual dimorphism in weight, with males weighing up to 20 kg (44 lb) and females up to 12.5 kg (28 lb). [4]

A close-up of face Penetrating Gaze (18022189239).jpg
A close-up of face

The body is overall a dark grey-brown. Mature males have a pink lower lip and white chin on a dark grey to black face with raised grooves on the nose. The rump is pink, mauve and blue. Female drills lack the pink chin.

Taxonomy

Two subspecies of drill are accepted by some authorities, [4] but are not considered distinct by others: [5]

Their closest relative is the mandrill (Mandrillus sphinx), found from southern Cameroon through mainland Equatorial Guinea (Rio Muni), Gabon and into the Congo. The two species are allopatric across the Sanaga River.

Biology

A dominant male leads a multi-male multi-female group of 20-30 individuals, and is father to most of the young. This group may join others, forming super groups of over 100 individuals. They are seasonally semi-nomadic, and will often rub their chests onto trees to mark their territory. They are semi-terrestrial, foraging mainly on the ground, but climbing trees to sleep at night. The females give birth to a single baby; twins have been recorded once at the Drill Rehab & Breeding Center in Nigeria. [4] The average longevity in captivity is 28 years. The diet is primarily frugivorous, taking a wide range of fruit, but they also eat herbs, roots, eggs, insects, and small mammals on occasion. [4] [6]

Distribution

Male drill in Boki, Cross River Drill Monkey.jpg
Male drill in Boki, Cross River

Drills are found only in Cross River State in Nigeria, southwestern Cameroon (south to the Sanaga River), and on Bioko Island, part of Equatorial Guinea, in rainforest habitats. Their entire global range is less than 40,000 km2.

Conservation

Drills are among Africa’s most endangered mammals, and are listed by the IUCN as the highest conservation priority of all African primates. [2] Drill numbers have been declining in all known habitat areas for decades as a result of illegal commercial hunting, habitat destruction, and human development; as few as 3,000 drills may remain in the wild, with the highest population estimate only 8,000. A total of 174 drills recovered from illegal capture are in semicaptivity at the Drill Rehabilitation and Breeding Centre in Nigeria, with high success rates in breeding recorded there, [7] and about 40 in other zoos internationally. [4]

Related Research Articles

<span class="mw-page-title-main">Mandrill</span> Species of Old World monkey from Africa

The mandrill is a large Old World monkey native to west central Africa. It is one of the most colorful mammals in the world, with red and blue skin on its face and posterior. The species is sexually dimorphic, as males have a larger body, longer canine teeth and brighter coloring. It is the largest monkey in the world. Its closest living relative is the drill, with which it shares the genus Mandrillus. Both species were traditionally thought to be baboons, but further evidence has shown that they are more closely related to white-eyelid mangabeys.

<i>Mandrillus</i> Genus of Old World monkeys

Mandrillus is a genus of large Old World monkeys distributed throughout central and southern Africa, consisting of two species: M. sphinx and M. leucophaeus, the mandrill and drill, respectively. Mandrillus, originally placed under the genus Papio as a type of baboon, is closely related to the genus Cercocebus. They are characterised by their large builds, elongated snouts with furrows on each side, and stub tails. Both species occupy the west central region of Africa and live primarily on the ground. They are frugivores, consuming both meat and plants, with a preference for plants. M. sphinx is classified as vulnerable and M. leucophaeus as endangered on the IUCN Red List of Threatened Species.

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<span class="mw-page-title-main">Bioko drill</span> Subspecies of Old World monkey

The Bioko drill is a subspecies of the drill, an Old World monkey. It is endemic to Bioko Island, Equatorial Guinea, located off the west coast of Africa. The drill is one of the largest monkey species, and is considered endangered. The Bioko drill was separated from their mainland counterpart, due to rising sea levels after the end of the last ice age, around 10,000 years ago. The capital of Equatorial Guinea, Malabo, is on Bioko Island. The Malabo market is the primary point of sale for bushmeat on Bioko Island. The drill plays an important role in the cultural tradition of bushmeat consumption, and is locally considered to be tasty, and in some regions, a delicacy. The commercialisation of hunting on Bioko Island has made this practice unsustainable. Hunting of the Bioko drill is banned in most areas of Bioko Island, as they predominantly inhabit protected areas on the island. However, the ban is considered ineffective; hunting remains the largest threat to the drill's population.

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<span class="mw-page-title-main">Northern needle-clawed bushbaby</span> Species of primate

The northern needle-clawed bushbaby is a species of strepsirrhine primate in the family Galagidae. It is found in the coastal region of Cameroon and Nigeria, and on the island of Bioko, Equatorial Guinea in lower-elevation forests that provide its specialized diet of tree gum and resins.

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References

  1. Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 165. ISBN   0-801-88221-4. OCLC   62265494.
  2. 1 2 Gadsby, E.L.; Cronin, D.T.; Astaras, C.; Imong, I. (2020). "Mandrillus leucophaeus". IUCN Red List of Threatened Species . 2020: e.T12753A17952490. doi: 10.2305/IUCN.UK.2020-2.RLTS.T12753A17952490.en . Retrieved 19 November 2021.
  3. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  4. 1 2 3 4 5 ARKive - Drill (Mandrillus leucophaeus) Archived 2015-07-14 at the Wayback Machine
  5. Primate Info Net: Drill
  6. Bioko Biodiversity Protection Program page on the drill Archived February 12, 2004, at the Wayback Machine
  7. the Drill Rehabilitation and Breeding Centre (Pandrillus) Buanchor Archived March 31, 2012, at the Wayback Machine