Brown greater galago

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Brown greater galago [1]
Thick-tailed Bushbaby (Otolemur crassicaudatus) (17322632725).jpg
Brown Greater Galago.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Strepsirrhini
Family: Galagidae
Genus: Otolemur
Species:
O. crassicaudatus
Binomial name
Otolemur crassicaudatus
Brown Greater Galago area.png
Brown greater galago range

The brown greater galago (Otolemur crassicaudatus), also known as the large-eared greater galago or thick-tailed galago, is a nocturnal primate, the largest in the family of galagos. As opposed to smaller galago species it would climb, walk or run rather than leap. [3]

Contents

Taxonomy

Two subspecies of Otolemur crassicaudatus are recognised: [1]

The IUCN considers the silvery greater galago as a third subspecies, O. c. monteiri. [2] Other sources treat it as a separate species, though with "misgivings". [4] The IUCN Red List assesses all three forms individually as Least Concern.

Physical characteristics

Illustration by Joseph Wolf GalagoCrassicaudatusWolf.jpg
Illustration by Joseph Wolf

This species has a rounded head with a short, wide snout, very large ears that can be moved independently and relatively large forward binocular eyes. [5] They possess flat thickened skin pads at the ends of their fingers and toes for grasping limbs. The fingers are long and toes are flattened with flattened nails. The dentition formula is I 2/2, C 1/1, P3 3/3, M3/3. [6]

The thick fur is highly variable in color, depending on the subspecies: O. c. crassicaudatus exhibits dorsal pelage ranging from buff to gray extending to the face, flanks and limbs. The ventral fur is cream colored, and the tail has a darker tip. The hands and feet are darkened except on the digits. O. c. kirkii exhibits fur ranging from brown to grey on the dorsal surfaces. Ventrally, the fur is cream to yellow colored. The tail is usually light brown in this subspecies and the feet and hands lack darkening pattern. [5] [7]

The brown greater galago has a head-and-body length of 26 to 47 cm (32 cm on average), a tail length of 29 to 55 cm, and a weight of 0.5 to 2 kg. The brown greater galago exhibits sexual size dimorphism with males being larger than the females. This is due to bimaturism, a longer period of growth in the male, on average 84.5 more days. While males and females galagos grow at the same rate, this longer growth period results in males averaging 16% more body mass than females. [8] On average females weigh 1.2 kg (2.6 lb), and males 1.5 kg (3.3 lb). [9]

Distribution and habitat

This species is common in Southern and East Africa. The largest populations are found in Angola, Tanzania, southern Kenya and the coast of Somalia. The brown greater galago lives in tropical and subtropical forest, preferring riverine and coastal forest, but it can also be found in the woodland savannah. [5] The subspecies display different ranges: O. c. crassidautus is only found in the KwaZulu-Natal region. O. c. kirkii is found from Massangena north to Vila Coutinho, Mozambique and Malawi. [7]

Behaviour

The brown greater galago is a nocturnal, arboreal animal. [9] During the day, it rests 5 to 12 meters (16 to 39 ft) above the ground in a dense tangle of creepers or in the hollow of a tree, rarely on an exposed branch. Female galagos will make nests, leafy platforms with foliage above to shelter their young. [7] An individual galago may have several sleeping sites throughout its home range. At night, it emerges to forage for food. It moves quadrupedally through the trees or bush. This species is capable of short jumps from tree to tree when necessary. [7] Its diet consists of fruit (like berries, figs), seeds, acacia gum, flowers, insects, slugs, and even reptiles and small birds. An individual galago on average spends 50% of its time each night traveling and only about 20% of its time foraging. It will often follow the same patrol pathway every night. [7] Galago lifespan in captivity is 18 years or more. It is likely that life expectancy in the wild is lower. [6]

Territory and social behavior

In Hluhluwe, South Africa Brown Greater Galago (Otolemur crassicaudatus) (31812658647).jpg
In Hluhluwe, South Africa

This species is solitary, living in a home range of a few hectares; however, there is some overlap with other individuals. Males have territories that overlap with a few females and females may have home ranges that overlap, but male territories generally do not overlap. [7] Males tend to have a larger territory than females. The territory is marked by urine and a scent produced in a gland in the chest. [9] Social interaction generally occurs at sites of range overlap, sites of large gum resources or prime sleeping trees. Social play is also exhibited by juveniles, sub adults and adult females with juveniles. [7] Social grooming is absent in the greater galagos compared to other primate species. It is instead filled with a behavior known as reciprocal licking to clean each other's fur. [7]

Vocal communication is very important in galago species with significant research systematically identifying types of calls including: raucous cry call, alarm call, contact rejection calls, distress call, infant call, mother call, advertising call.

Reproduction morphology and behaviour

Male galagos species possess very distinctive penile morphology that can be used to classify species. [10] In O. crassicaudatus, the penis is on average 20 mm (0.79 in) in length and increases in width towards the distal tip. The baculum clearly protrudes from the end. The glans and shaft are covered in single keratinised penile spines that point towards the body. [11] [12] [13]

During mating season which occurs in June, the female goes into estrus for approximately 2 weeks. She uses an advertising call to indicate her receptivity. Males approach and copulate repeatedly with the female and maintain intromission with the female for several hours. [7] Mating patterns can be either monogamous or polygynous, often determined by the overlapping of host ranges and competing of males for best territories. [6] Females typically give birth to 2 young, sometimes 1 or 3. The gestation period is on average 133 days. The female typically reaches sexual maturity by 2 years of age. Because of competition between males based upon size males usually reach reproductive age later than females. [6] After birth, the mother leaves the young to forage and returns nourishing the young with nutrient rich milk. The juveniles typically remain with their mother until they reach close to sexual maturity. [6]

Conservation

The brown greater galago is listed as Least Concern by the International Union for Conservation of Nature (IUCN). The species is thought to be common in well managed protected areas. The only major threat to the species is hunting for bushmeat. Habitat fragmentation is increasing across their range, with sugar cane and forestry in South Africa being a main cause. [2]

Related Research Articles

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

The Senegal bushbaby, also known as the Senegal galago, the lesser galago or the lesser bush baby, is a small, nocturnal primate, a member of the galago family Galagidae.

<span class="mw-page-title-main">Greater galago</span> Genus of primates

The greater galagos or thick-tailed bushbabies are three species of strepsirrhine primates. They are classified in the genus Otolemur in the family Galagidae.

<span class="mw-page-title-main">Zanzibar red colobus</span> Species of Old World monkey

The Zanzibar red colobus is a species of red colobus monkey endemic to Unguja, the main island of the Zanzibar Archipelago, off the coast of Tanzania. It is also known as Kirk's red colobus after Sir John Kirk, the British Resident of Zanzibar who first brought it to the attention of zoological science. It is now classified as an endangered species and in the mid-1990s was adopted as the flagship species for conservation in Zanzibar. The population is still decreasing, and conservationists are attempting to work with the local government to devise a proper, effective strategy to protect the population and habitat. Challenges include the species' habitat, which is limited to the archipelago. The species has been reclassified three times; it was previously in the genus Colobus, then in the genus Procolobus, and later in the genus Piliocolobus.

<span class="mw-page-title-main">Geoffroy's tamarin</span> Species of New World monkey

Geoffroy's tamarin, also known as the Panamanian, red-crested or rufous-naped tamarin, is a tamarin, a type of small monkey, found in Panama and Colombia. It is predominantly black and white, with a reddish nape. Diurnal, Geoffroy's tamarin spends most of its time in trees, but does come down to the ground occasionally. It lives in groups that most often number between three and five individuals, and generally include one or more adults of each sex. It eats a variety of foods, including insects, plant exudates, fruits and other plant parts. Insects and fruits account for the majority of its diet, but exudates are also important. But since its teeth are not adapted for gouging trees to get to the sap, it can only eat exudates when they are easily available.

<span class="mw-page-title-main">Pig-tailed langur</span> Species of Old World monkey

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<span class="mw-page-title-main">Sunda slow loris</span> Species of primate found in South East Asia

The Sunda slow loris, or greater slow loris, is a strepsirrhine primate and a species of slow loris native to Indonesia, West Malaysia, southern Thailand and Singapore. It measures 27 to 38 cm from head to tail and weighs between 599 and 685 g. Like other slow lorises, it has a wet nose (rhinarium), a round head, small ears hidden in thick fur, a flat face, large eyes and a vestigial tail.

<span class="mw-page-title-main">White-faced saki</span> Species of New World monkey

The white-faced saki, called the Guianan saki and the golden-faced saki, is a species of the New World saki monkey. They can be found in Brazil, French Guiana, Guyana, Suriname and Venezuela. This species lives in the understory and lower canopy of the forest, feeding mostly on fruits, nuts, seeds, and insects. Although they are arboreal creatures and are specialists of swinging from tree to tree (brachiation), they are also terrestrial when foraging. White-faced sakis typically live around 14 years in their natural habitat and have been recorded to live up to 36 years in captivity. Sakis are active in the day and sleep highly elevated (15-20m) in trees with many leaves to shelter them from weather and flying predators.

<span class="mw-page-title-main">Black lemur</span> Species of lemur

The black lemur is a species of lemur from the family Lemuridae. Like all lemurs, it is endemic to Madagascar. Originally, the species was thought to have two subspecies, Eulemur macaco macaco and Eulemur macaco flavifrons, both of which were elevated to species status by Mittermeier et al. in 2008 to Eulemur macaco and Eulemur flavifrons respectively. The most startling difference between the two species is the eye colour; Eulemur flavifrons, the blue-eyed black lemur, has blue eyes, while Eulemur macaco, the black lemur, has brown or orange eyes, and also has ear tufts.

<span class="mw-page-title-main">Northern muriqui</span> Species of New World monkey

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<span class="mw-page-title-main">Silvery lutung</span> Species of Old World monkey

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<span class="mw-page-title-main">Northern greater galago</span> Species of primate

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<span class="mw-page-title-main">Madame Berthe's mouse lemur</span> Species of mammal

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<span class="mw-page-title-main">Collared mangabey</span> Species of Old World monkey

The collared mangabey, also called red-capped mangabey and white-collared mangabey, is a species of primate in the family Cercopithecidae of Old World monkeys. It formerly included the sooty mangabey as a subspecies. As presently defined, the collared mangabey is monotypic.

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

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

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<span class="mw-page-title-main">Silvery greater galago</span> Species of primate

The silvery greater galago is a nocturnal primate from the galago family. It is usually found in Brachystegia woodland, from Angola to Tanzania, western Kenya and Rwanda.

<span class="mw-page-title-main">Cross River bushbaby</span> Subspecies of primate

The Cross River bushbaby, also known as the Cross River squirrel galago, is a subspecies of prosimian primate in the family Galagidae which is endemic to a restricted area of West Africa. It is one of four species of squirrel galago in the genus Sciurocheirus.

<span class="mw-page-title-main">Milne-Edwards's sifaka</span> Species of lemur

Milne-Edwards's sifaka, or Milne-Edwards's simpona, is a large arboreal, diurnal lemur endemic to the eastern coastal rainforest of Madagascar. Milne-Edwards's sifaka is characterized by a black body with a light-colored "saddle" on the lower part of its back. It is closely related to the diademed sifaka, and was until recently considered a subspecies of it. Like all sifakas, it is a primate in the family Indriidae.

References

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