About Us  
Volunteering
Support Us
Conservation Solutions
Daily Blog
News Archive
Visit Us
Contact Us  
Home
Angolan Colobus
Other Primate Species
Local Flora & Fauna
Research & Publications
Primate Rescue
Diani's Ecosystem
South Coast Eco-Tourism
  
OTHER PRIMATES IN DIANI
Abstracted from information compiled by R. Eley and P. Kahumbu -- The colobus isn't the only primate in Diani.  In fact, there are three primate families on the south coast at Diani: 1.) Family Lorisinae (bushbabies), 2.) Family Cercopithecidae (vervets, sykes, baboons, colobus) and 3.) Family Hominidae (humans).
Vervet Monkeys
Cercopithecus aethiops
Cercopithecus monkeys are the most common monkeys found in Africa.  Five of the 20+ species found in Africa can be found in Kenya and both the Vervet and Sykes monkeys can be found commonly in Diani.  The Vervet (also known as the "African green monkey") is a grey-brown monkey with white under parts, white-fringed black face, long whitish cheek wiskers, white brow, black feet and black tip of the tail.  Males posses a blue scrotum, red penis and red peri-anus and weigh around 4 to 6 kg and measure 40 to 60 cm when adult.  Females are normally 2 to 5 kg and measure 30 to 50 cm.  Female breasts also often have a bluish tinge to them.  Infants have similar, but lighter, colouration and also have pink faces. 

Normally found in savannah, woodland, riverine, lake-shore and coastal forests - Vervets normally do not inhabit heavily forested areas of very open grasslands.  They are widely distributed around southern Africa (south of the Sahara Desert) and are found throughout Kenya - even in the city of Nairobi!

Vervets are omnivorous, opportunistic feeders eating fruit, seeds, roots, bark, flowers, gum, insects, small vertebrates and eggs.  In Diani, tourist tid-bits provide a healthy portion of many Vervets' daily diet and all visitors are warned not to feed them.  Although they adapt easily to new situations and seem tame when used to human feeding, they are still wild animals and are treated as such.  This includes being disease carriers, rabies and other bite diseases and could result in the animals being put down.

Vervets are equally at home on the ground and in the trees, and this flexibility is reflected in their distribution.  They live within troops of 20 to 30 animals with a linear dominance hierarchy among males, and (like baboons) a kinship relationship among females.   Complex communication among Vervets has been documents for some time, with characteristic and different calls being contextual for different sorts of situations and eliciting different responses in return.  For example, alarm calls for aerial predators differ from alarm calls for snakes are different - requiring the Vervets in the area to look in different places to triangulate the danger.

Sykes Monkeys
Cercopithecus albogularis
Sykes monkeys are also widely distributed on the Kenyan coast and are a common sight in Diani.  They are approximately the same size as a Vervet, ranging from 50 to 70 cm in body length and weighing 6 to 9 kg for males and 3 to 6 kg for females.

Their colour is largely grey, with a blackish tail, limbs and shoulders, and a distinctive flecked chestnut back and face.  They have a white chin and throat and a white ruff which extends part of the way around the neck.  The forehead hairs point forward, creating a yet more distinctive look.  Infants are similar, but with a slightly darker coat and pink face.

Skyes monkeys are arboreal and found in all sorts of heavily wooded areas, including the coast.  They are omnivorous, although their main food is leaves, shoots, flowers, fruits and berries.  They will also feed on birds eggs, insects and other food like human food - for which they are notorious and sly thieves.

Skyes monkeys are highly territorial and live in female bonded, single-male troops (averaging 20 individuals in Diani) although they tend to forage in a more dispersed manner.  Sykes troops are remarkably stable and peaceful groups, with resident males maintaining dominance for years on end and sub-adult males being evicted readily.  Outsider males often learn to imitate the dominant male's call to lure away females.  Interestingly enough, these monkeys sometimes associate with the colobus, grooming and playing with each other at times, especially juveniles.  It is thought that the colobus tolerate the Sykes monkeys because they are extremely vigilant and are usually first to notice any danger.

Skyes monkeys also make a curious assortment of vocalisations, from soft bird-like chirping to trilling sounds given by sub-adults as a sign of submission when approaching an adult.  Loud chirps and bird-like alarm calls bring the troop into a state of alertness.  Growls and screams are emitted during chases between troop members and a series of puled calls are given in alarm to birds of prey.

Yellow Baboons
Papio cynocephalus
Baboons belong to the genus Papio which is divided into five species - Olive, Yellow, Chacma, Guinea and Hamadryas - of which the Olive and Yellow are found in Kenya.  Baboons are monkeys (although they are often wrongly referred to as apes) and are not threatened although their numbers have been declining in Africa overall in the recent years because of eradication programmes.

The Yellow baboon is a mainly terrestrial, coastal baboon with yellow-brown hair, barrel chests, a prominent muzzle, naked face, large cheek pouches and close-set, amber-coloured eyes.  They back legs are shorter then their front legs, giving them a characteristic backward sloping stance - and they often climb trees for food and as a place to sleep.  They walk on their fingers and the soles of their feet.

Baboon infants are born black with pink faces, hands and ears, but turn brown in colour with darker faces with older age, usually beginning at about six months of age.  Both males and females have large, grey-skinned sitting pads called "ischial" callosites (separated in females but joined in males).  Females have pronounced sexual swellings between the sitting pads (so, for example - the photo on the right shows a normal baboon with such swelling).

A mature male baboon is an imposing sight, weighing 20-30 kg and a head-body length of 70 cm, standing 50 cm at teh shoulders.  Males are approximately twice the size and weight of females.  Apart from colour, the two Kenyan species of baboon are very similar in appearance, although the thinner coat of the Yellow baboon vs. the thick hair/manes of the Olive baboon make it look smaller in comparison.  It takes males around seven to eight years to reach maturity, although they will continue to grow for a few years after that as well.  Females reach sexual maturity at five years.

The primary habitat of the Yellow baboons is the savannah, but these highly opportunistic and adaptive animals can survive almost anywhere. In Kenya they occupy many habitats and have flourished in the Diani area.  They naturally eat roots and bulbs, grasses, herbs, flowers, buds, fruits and leaves - as well as catch insects and are known to prey on rodents, rabbits and birds.  In Diani and other populated areas, their diet extends to human food and they are notorious raiders of crops and garbage.

They also live in complex social societies made up of multi-male and multi-female troops, ranging in size from 10 to even 200 individuals.  Each troop occupies a home range which varies in size from 2 square km in heavily wooded areas to 30 square km in more open areas.  Baboons are extremely noisy creatures as well, communicating through an array of sounds accompanied by gestures and postures.  They are known in Diani to make loud and boisterous displays daily, at dawn and at dusk.

Bush Babies
Galago senegalensis (Northern lesser)
Otolemur crassicaudatus (Thick-tailed greater)
Galagos (or as they are more commonly known "Bush babies") are found in most forested and wooded areas in sub-Saharan Africa.  They are also only found in Africa.  In Diani, they frequent gardens and kitchens during the night, searching for food.

They are small, nocturnal animals with very large eyes and excellent senses of hearing and smell.  Their muzzles are pointed and they have mobile ears and long bush tails and more teeth than Old World monkeys (36 teeth for Bush babies, as opposed to 32).  They additionally have extremely delicate fingers and extreme gripping power by pads on their fingers and toes - although on the ground their locomotion more resembles the kangaroo, jumping and pausing to look around.  Bush babies diet varies slightly from place to place, but normally comprises - in the Greater - a mixture of insects, small reptiles and plant products and - in the Lesser - includes fruit.  Prey is caught by pouncing and biting.

They are extremely social creatures and enjoy frequent interactions among each other, both of like and opposite sex.  This is despite having exclusive ranges of from 1 to 3 hectares which thy guard and mark with urine, smeared on hands and feet, nightly.  Bush babies are seasonal breeders and reach sexual maturity from age 1 to 2.  Young are similar to adults although newborn Bush babies are naked on the underside for a period of approximately 1 week.  For the first few months, baby Bush babies have been seen to be carried by their mothers in their mouths, similar to the behaviour of the domestic cat.

 

About Us  
Volunteering
Support Us
Conservation Solutions
Daily Blog
News Archive
Visit Us
Contact Us  
Home
Angolan Colobus
Other Primate Species
Local Flora & Fauna
Research & Publications
Primate Rescue
Diani's Ecosystem
South Coast Eco-Tourism
  
Local Fauna and Flora in the Diani Area and at the Colobus Cottage
Primates aren't the only thing to see on the south coast of Kenya.  The region offers a great array of mammals and birds, reptiles, marine life and flora for exploration.  Here are some of the different things you can see in the forest at the Colobus Cottage .
Mammals
Zanj Elephant Shrew  (Rhynchocyon petersi)  This unique shrew eats invertebrates (particularly ants) found in leaf litter and has been declared rare by the IUCN.  It is about the size of a rat and has a long tapering snout which gives it its namesake. It has a pungent smell which derives from a gland behind the anus.   Not much is known about these shrews, although they are living in the forests in Diani.

Suni  (Neotragus moschatus)  Suni are small forest antelope only 40cm tall although the male's horns can reach 13cm.  Their facial glands are enormous, especially in the male, and they have a strong body odour which demarcates territory and identifies sex and status but may also act as insect repellant.  They are browsers with a varied diet of leaves, shoots and herbs, and they gather under feeding colobus monkeys to pick up dropped leaves and shoots of brittlewood.  They rely on smell, and visible and invisible scented pathways are followed with individual and communal dung middens on the peripheries of a territory.  They feed in short bursts interspersed with rests and are most active after rainstorms and around dusk and dawn.  They rest during the heat of the day.  They live mainly in monogamous pairs on territories of approximately 3 ha

Mongooses  (Herpestidae)  These primarily terrestrial predators eat  invertebrates, small vertebrates and sometimes fruit.  Most species are water dependant inhabitants of forests, woodlands, savannahs and marshes; however, some can go long periods without water.  They depend on scent to communicate and mark territories.  Anal secretions constitute long-lasting, individual signatures while cheek-gland secretions produce a short term status related signal that can trigger immediate aggression.  Their ability to roll and crash/crack eggs and to kill dangerous snakes is well known.  Both are instances of the manipulative skills, speed and versatility of many mongooses in their hunting techniques.  Mongooses likely to be seen in Diani are the Egyptian mongoose, slender mongoose, white-tailed mongoose and bushy tailed mongoose.

Genets and Civets (Viverrinae)  Genets and civets are to carnivores what lemurs are to the higher primates. Civets, in particular, are modern approximations of all carnivores’ common ancestral stock.  These carnivores are generally solitary foragers, spanning most major habitats.  Scent is their most fundamental mode of communication, and all species use glandular secretions to regulate contacts and behaviour. They are almost entirely terrestrial, solitary foragers and not endangered.

Genets (Genetta)  have slender, long, cat-like bodies and cat-like semi retractable claws. They have soft, spotted or blotched fur (occasional black morphs are also known) with banded tails.  These nocturnal animals are normally silent although they spit, hiss, growl, purr and meow like cats.  They are omnivorous (eating vertebrates, invertebrates and plant matter) and rely on speed and agility and cryptic colouring to catch food as well as evade large predators.  They are solitary except for brief courtships.  In Diani we have the common genet - with a crest of long fur along the spine, a ringed tail and small, numerous, linear dark spots on a sandy background.  They eat rodents as their main staple.  Also seen often is the blotched genet, which has a blotchy coat.  They eat rodents, invertebrates and fruits.

African civet (Civettictis civetta) is the only civet to be found in this area. These dog-like animals make very conspicuous dung middens called civetries.  They are largely terrestrial and normally silent, although they growl very deeply if harassed.  They are omnivores adapted to eating poisonous fruits, such as Strychnos, insects, millipedes and dangerous snakes. They are able to feed irregularly and even fast for two weeks at a time.  They have up to four young born 60-72 days after mating which are born in a burrow, crevice or dense vegetation. Civet secretions are so copious and durable that they once provided the perfume trade with a valuable fixative for floral scents.

Bats There are two types of bats in Diani -- insect eaters (insectivores) and fruit eaters (frugivores). In spite of the similarities between fruit and insect eating bats which suggests a very ancient common ancestry, fruit bats actual have more affinities with primates. Possibly they evolved from lemur-like gliders.

Insectivores use echo-location to pinpoint obstacles and prey. Species whose niche is under the canopy utilise higher frequencies and therefore have greater precision. Those that are in open areas use lower frequencies as they require lower precision. Insect eating bats have clawless wings, complex teeth, small eyes and complex ears with irregular margins.

Frugivores do not use echolocation and are mediocre navigators and usually fly above the forest canopy. They have large eyes, claws on their wings, funnel-shaped ears, large tongues, blunt short teeth and deeply ridged palates which while working together, crush and squeeze the fruit so that only juice and pulp are swallowed. Fibres and rind are usually spat out. They rely on a year-long supply of fruits and flowers. They can be important as pollinators and are very Important as seed dispersers

African Hedgehogs  (Atelerix)  The evolution of spiny armour has been a major factor in these hedgehogs’ survival as a group. They are successful and widespread modern survivors of a very ancient group. The spines are embedded into a muscle that is anchored to the forehead which contracts and becomes a bag into which the body, head and legs are withdrawn. The spines are effective protection though some owls and other carnivores have no problem killing and eating them. These nocturnal insect-eaters trot with fast leg movements but hunch or roll into prickly balls at any disturbance. They find prey by scent and sound.

Bush pigs  (Potamochoerus larvatus)  Bush pigs range across Kenya up to 4000 metres on Mt. Kilimanjaro and live in forest and woodland habitats. They are omnivorous - eating roots, tubers, bulbs, fruits, larvae, beetles, snails, amphibians and reptiles.  One group of them has even been seen to drive a leopard off its kill! Their home ranges are about 10km 2, while nightly they forage up to 6 km2.  They are a major pest for farmers and are hunted for control and meat. Without natural predators, they can become very abundant as they have short gestation periods (120 days), large litters, and fast maturation rates. 

Insects
Butterflies There is an array of brightly coloured butterflies found in the area.  Of these, the Didem (Hypolimnas chrysippus) is of particular interest as the males are dark blue with large white spots, while the females are bright orange, mimicking another species of butterfly (similar in colouring to monarchs) called the African queen (Danaus chrysippus) which has a foul taste and so is safe from predators.  Other species include the golden, violet/ blue, and black coloured Gold Banded Foresters (Euphaedra neophron) and a number of charaxes and swallowtails including the striking narrow banded swallowtail.

Coastal giant millipede  (Archispirostreptus gigas)   This is the largest of the giant millipedes reaching over 10cm.  They can cause serious localized seasonal damage to crops and small forestry seedlings.  In dry conditions, they feed on living plants and burrow down in crevices; while in wet conditions, their populations appear to increase explosively.  They mainly feed on leaf litter and other dead materials.  The species Epibolus pulchripes is more common on the coast.  It seldom damages plants but is very useful in humus formation.  Predators to the giant millipedes include civets, mongoose, and some birds.

Birds
Owls  Their eyes can see in dim light (but not in total darkness), and they have the best hearing of all birds.  They eat mice, rats and large insects  Owl eyes face forward so that they can focus on their fast-moving prey and judge distances. They have large ear openings, protected by feathers, to hear their prey. Local species include the barn owl, white-faced scops-owl, pearl-spotted owlet, African barred owlet, and spotted eagle-owl.

Silvery-Cheeked Hornbill  (Ceratogymna cylindricusThis striking, large bird is at home in Diani and forests, parks and gardens along the Kenyan South Coast and as far as Nairobi.  It is distinguishable by its large casque which is an extension of its upper beak.  It has a far-carrying and raucous call, but can also utter soft clucks, bleats and grunts.  Wingspans can be over 75 cm in the males and 65 cm in the females.

Trees
Strangler figs (Ficus lingua)  Strangler figs are plants known as epiphytes (plants that start by growing on other plants).  Researchers have postulated that this epiphytic habit is an adaptation to avoid fire and being foraged on by herbivores. Fig trees are not parasitic; they only get physical support from the host plant.  Once the seedling high up in the host tree takes root, it sends its roots downwards until they reach the ground where they dig in and start growing aggressively.  It has been reported that they do not get any nutrients out of their host plants directly, but rather they compete for the same water, light and nutrients of the host tree.  The strangler fig eventually kills its host through this competition as it has a stronger sucking force to draw in water than other trees

Baobab (Adansonia digitata)  Truly a tree that represents Africa, this striking deciduous tree of immense girth grows up to 25 meters in height. It is bare of leaves up to 9 months of the year, leaving immense bare branches, earning the baobab the nick-name “the upside down tree”. Despite its soft, pithy wood, it is one of the longest lived trees in the world. Carbon dating has shown trees 5m wide to be 1000 years old and the largest to be about 3000 years old.  Portuguese cannon balls from nearly four centuries ago have been found embedded in living trees that line the approach to Mombasa harbour.

The bark is grey, smooth and fibrous, often pock-marked and heavily folded. Leaves are compound, ‘digitate’, dark green and shiny. The solitary flowers have 5 waxy petals surrounding a ball of fine stamens; they hang upside down on hanging stalks and are unpleasantly scented. Fruits are large, hard-shelled capsules up to 24 cm long which remain on the tree after ripening.  Their leaves are a favourite of the colobus, and their fruit is eaten by other monkeys, though only the baboon can crack them open once they’re full grown.

Prickly Ash (Zanthozylum chalybeumThis is an indigenous, evergreen shrub or tree 1.5 to 10 meters or more.  It is found often in rocky sites (like the Diani forests which are on coral rock). Its trunk is furrowed with corky knobs or ridges crowned with spines. Leaves are compounded  with 5 to 11 leaflets. Its flowers are yellow-green and are usually borne below the leaves. The fruit is tiny, only 5 – 8 mm long.  It is used locally to treat chest infections and sore throats and to induce vomiting.  A bark infusion is given to sick camels.  Because of its fresh citrus smell and taste, it’s also used to spice tea. The leaves are eaten by colobus.

Neem Tree (Azadracta indica This tree is common on the coast, though it is not indigenous to Africa. It is a hardy tree which grows up to 118 meters. It has a rough, pale brown-grey bark, small, glossy-green compounded leaves, small white or cream-coloured fragrant flowers and small oval, greenish-yellow berries.  It is widely planted on the coast for fuel, timber, shade, agroforestry in exhausted soils, and as traditional medicine for treating 40 diseases, including malaria. It is also used for soap making.  Colobus like to eat its leaves while its berries are a favourite for sykes and vervets.

Flamboyant (Delonix regiaAnother exotic plant found in Diani and a favourite of the colobus monkeys. It is one of the most beautiful trees, particularly when it flowers; each brilliant scarlet-red flower reaches up to 10cm across with wavy petals, of which the uppermost is creamy white and splashed with scarlet. It has a flat or umbrella shaped crown; its bark is grey and smooth; its leaves are light green and feathery, with leaflets mostly less than 1 cm long. The fruits are long, brown, heavy pods honeycombed into horizontal seed chambers.  These seed pods are also favoured by baboons and sykes. Vervets also eat them.

 


WAKULUZU: FRIENDS OF THE COLOBUS TRUST

P.O. Box 5380, 80401 Diani Beach, Kenya
Tel: + 254 (0) 711 479 453 / + 254 (0) 20 202 4139
Email: info@colobustrust.org