Hermann Brehm / Vervet monkey (Chlorocebus / Cercopithecus aethiops) in tree, Serengeti NP, Tanzania

Bernard Castelein / Vervet monkey (Chlorocebus / Cercopithecus aethiops) male in tree, Samburu Park, Kenya

Dietmar Nill / Vervet monkey suckling young (Chlorocebus / Cercopithecus aethiops) Ruha NP, Tanzania

Nick Garbutt / Proboscis monkey female + young in tree {Nasalis larvatus} in riverine forest. Sukau, Sabah, Borneo, Malaysia

Nick Garbutt / Proboscis monkey female {Nasalis larvatus} in tree, riverine forest. Sukau, Sabah, Borneo

Juergen Freund / Proboscis monkey leaping from tree {Nasalis larvatus} Borneo, Indonesia

Anup Shah / Young Proboscis monkey peeping out from behind mother {Nasalis larvatus}

Anup Shah / Vervet monkey standing (Chlorocebus / Cercopithecus aethiops) Masai Mara NR, Kenya

Phil Savoie / Proboscis monkey male calling {Nasalis larvatus} captive, Zoo.

Phil Savoie / Proboscis monkey male {Nasalis larvatus} captive, Zoo.

Nick Garbutt / Proboscis monkey male {Nasalis larvatus} in riverine forest Sabah, Borneo Malaysia

Nick Garbutt / Proboscis monkey male {Nasalis larvatus} in riverine forest Menanggol, Sukau, Sabah, Borneo

Nick Garbutt / Proboscis monkey male {Nasalis larvatus} in riverine forest Menanggol, Sukau, Sabah, Borneo

Nick Garbutt / Proboscis monkey female {Nasalis larvatus} in riverine forest. Sukau, Sabah, Borneo

RICHARD KIRBY / Black and white colobus monkey feeding on flowers in tree {Colobus guereza} Kibale Uganda

Barrie Britton / Juvenile Vervet monkey raids kitchen {Cercopithecus aethiops} Durban South Africa

Peter Blackwell / Black and white colobus monkey {Colobus guereza} male Lake Naivasha Kenya

Richard Du Toit / Vervet monkeys social grooming {Cercopithecus aethiops} Kruger NP South-Africa

Nick Garbutt / Male Black and white colobus monkey {Colobus guereza} Lake Naivasha Kenya East Africa

Peter Blackwell / Black and white colobus monkey with white baby {Colobus guereza} Mount Kenya East Africa