From Wikipedia

The Diana monkey (Cercopithecus diana) is an Old World monkey found in the high canopy forests in Sierra Leone, Liberia, and western Côte d’Ivoire. Named for its white brow which is said to resemble the bow of the Roman goddess Diana, this black-grey guenon has a white throat, crescent-shaped browband, ruff and beard.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/100s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The mandrill (Mandrillus sphinx) 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. 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.

Mandrills mainly live in tropical rainforests but will also travel across savannas. They are active during the day and spend most of their time on the ground. Their preferred foods are fruit and seeds, but mandrills will consume leaves, piths, mushrooms, and animals from insects to juvenile bay duiker. Mandrills live in large, stable groups known as “hordes” which can number in the hundreds. Females form the core of these groups, while adult males are solitary and only reunite with the larger groups during the breeding season. Dominant males have the most vibrant colors and fattest flanks and rumps, and have the most success siring young.

The mandrill is classified as vulnerable on the IUCN Red List. Its biggest threats are habitat destruction and hunting for bushmeat. Gabon is considered the stronghold for the species. Its habitat has declined in Cameroon and Equatorial Guinea, while its range in the Republic of the Congo is limited.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/250s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The brown spider monkey or variegated spider monkey (Ateles hybridus) is a critically endangered species of spider monkey, a type of New World monkey, from forests in northern Colombia and northwestern Venezuela.

Like all spider monkeys, it has long, slender limbs and a long prehensile tail. The brown spider monkey has a whitish belly and patch on the forehead, and – highly unusual among spider monkeys – its eyes can be pale blue.

Image Notes:
This photo was taken in the indoor enclosure with the monkey looking out of the window. Tripods weren’t allowed and the light level was generally low. Flash was out of the question as it would alarm the monkey. I kept the image as the blur seems to enhance the emotion of the monkey in the picture. I like it.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 140mm
Aperture: ƒ/4.5
Shutter Speed: 1/13s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

Squirrel monkeys are New World monkeys of the genus Saimiri. Saimiri is the only genus in the subfamily Saimiriinae. The name of the genus is of Tupi origin (sai-mirím or çai-mbirín, with sai meaning ‘monkey’ and mirím meaning ‘small’) and was also used as an English name by early researchers.

Squirrel monkeys live in the tropical forests of Central and South America in the canopy layer. Most species have parapatric or allopatric ranges in the Amazon, while S. oerstedii is found disjunctly in Costa Rica and Panama.

There are two main groups of squirrel monkeys recognized. They are differentiated based on the shape of the white coloration above the eyes. In total there are five recognized species. Squirrel monkeys have short and close fur coloured black at the shoulders, yellow or orange fur along the back and extremities, and white on the face.

Squirrel monkeys have determined breeding seasons which involve large fluctuations in hormones and there is evidence of sexual dimorphism between males and females.

Squirrel monkeys can only sweat through the palms of their hands and feet. This can have the effect of making their hands and feet feel damp to the touch. Squirrel monkeys must make use of other thermoregulation techniques such as behavioral changes and urine washing. These monkeys live in habitats of high temperatures and high humidity, making it essential for them to maintain proper osmoregulation if conditions pass certain thresholds. Color vision studies have also been performed on squirrel monkeys for the purpose of better understanding vision ailments in humans.

The common squirrel monkey is commonly captured for the pet trade and for medical research, but it is not threatened. Two squirrel monkey species are endangered: the Central American squirrel monkey and the black squirrel monkey are listed as vulnerable by the IUCN.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 250mm
Aperture: ƒ/5.3
Shutter Speed: 1/200s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/320s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/400s
ISO: 800
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/800s
ISO: 400
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/800s
ISO: 400
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/800s
ISO: 400
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

From Wikipedia

The hamadryas baboon (Papio hamadryas /ˌhæməˈdraɪ.əs/; Tigrinya: ጋውና gawina; Arabic: الرُبَّاح, Ar Robbaḥ) is a species of baboon within the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern region of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of ‘sacred baboon’.

Image details
Date: 19 September 2025
Camera body: Nikon D50
Lens: Tamron 70.0-300.0 mm f/4.0-5.6
Focal Length: 300mm
Aperture: ƒ/5.6
Shutter Speed: 1/1,000s
ISO: 400
Licence: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International