Nairobi Arboretum #5: Cheeky Monkey!
The cache, a small cylindrical screw-topped camo-pot is hidden at ground level under small rotting logs under the rear of a large rocky outcrop just to the side of the largest tree in the area.
To reach the cache location: from the Nairobi city centre, make your way to the Uhuru Highway/University Way roundabout @ S01 16.906 E36 48.896. Turn west here and continue a short distance to the next junction at the start of State House Drive. Turn right onto the drive and continue some 1.2km to the junction with the Arboretum access road @ S01 16.652 E36 48.364. Turn off here and continue to the end of the road and then left into the parking area @ S01 16.716 E36 48.182 adjacent to the Arboretum entrance. Parking is Kshs 50 and entry is free! Once inside the park, you can make your way to the cache location by multiple routes - ideally via one or more of the other caches! Head for the clearing on the north-west edge of the arboretum @ S01 16.582 E36 47.840. Once there take the small trail heading south into the trees just to the left of a tree with various carved names on its trunk. After about 10m head left towards the obvious/only rocky outcrop.
Note: as always in the arboretum when carrying out for caching activities, keep an eye out for passing muggles and other muggles performing religious activities amongst the trees!
One of the three primates you are almost certain to see as you explore the arboretum is a indeed a cheeky monkey - Chlorocebus pygerythrus - the Vervet monkey. To complete the picture the other two primates are Cercopithecus albogularis (Sykes Monkey) which is not very cheeky and tends to be more timid than the vervet and Homo sapiens (Human being) which can be cheeky, sometime downright rude and often quite badly behaved! Fortunately the sub-species H s. religiosus found in the arboretum are not at all cheeky - being totally absorbed in their religious activities . . . but they are still potential muggles!
The vervet is an Old World monkey native to Africa. Five distinct subspecies can be found in some 39 African countries mostly throughout southern Africa, 
as well as some of the eastern countries. They were introduced to southern USA and the Caribbean. They inhabit savanna, riverine woodland, coastal forests and mountains up to 4,000m. They are adaptable and can survive in secondary and/or highly fragmented vegetation, including cultivated areas, and sometimes are found living in both rural and urban environments. Their only limitation seems to be water availability and the presence of sleeping trees - used to decrease the risk of predation.
In their natural habitat, potential predators include lions, leopards, cheetahs, other feline predators like African wild cats, servals and caracals; hyenas, black-backed jackals, raptors and baboons. In some areas dogs are serious predators and throughout their range, humans hunt vervets (illegally in the case of Kenya) either for meat or as a means to control the population.
They are mostly herbivorous monkeys with black faces and grey body hair colour, ranging in length from about 50cm for males to about 40cm for females. Males of all species of vervets have bright blue scrotal areas contrasting with bright red penises. They move quadrupedally and are equally comfortable on the ground or in the trees. They spend time feeding and travelling on the ground during the day and retreating to the trees to sleep at night. They have characteristic cheek-pouches which allow them to forage and store food to be eaten later. They live in social groups of 10-70 individuals, with males changing groups at the time of sexual maturity.
When males reach sexual maturity, they move to a neighbouring group. Although this is of benefit in terms of distance travelled it also reduces genetic variance, increasing the likelihood of inbreeding. Females remain in their groups throughout life, giving birth annually between September-February, after a 165 day gestation 
period. Usually only one infant is born at a time, though twins can occur rarely. A normal infant weighs 300–400g.
Vervets feed mostly on wild fruits, flowers, leaves, seeds, and seed pods. In agricultural areas, they become problem animals, as they will raid bean crops, peas, young tobacco plants, vegetables, fruit, and various grain crops. Carnivorous diet includes grasshoppers and termites. They have also been observed raiding the nests of cattle egrets and weaver birds to eat the eggs and chicks.
As well as very interesting behavioural research on natural populations, vervet monkeys serve as a non-human primate model for understanding genetic and social behaviours of humans. They have been noted for having human-like characteristics, such as hypertension, anxiety, and social and dependent alcohol use.
For entertaining and informative short videos see here(drunken vervets), here(young vervets explore & play), here(more vervet babies at play), here(fighting for suburban territory), here(breaking & entering),
See also here for an account of them harassing and making rude gestures to village women in Kenya! . . .
(continues with GC6C3Y5 Nairobi Arboretum #3: Monkey Talk)