Anup Shah / Young Eastern common chimpanzee {Pan troglodytes schweinfurtheii} Opal's baby, Mahale NP, Tanzania.

Anup Shah / Young Eastern common chimpanzee {Pan troglodytes schweinfurtheii} Opal's baby, Mahale NP, Tanzania.

Eric Baccega / Chimpanzee female (Pan troglodytes schweinfurthii) sleeping in a nest built in a tree, Kibale National Park, Uganda, January.

Eric Baccega / Chimpanzee juvenile (Pan troglodytes schweinfurthii) in a tree. Kibale National Park, Uganda. January.

Eric Baccega / Chimpanzee male (Pan troglodytes schweinfurthii) sleeping on the forest floor with feet up, Kibale National Park, Uganda. January.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) juvenile female 'Fadhila' aged 5 years and her brother 'Fifty' aged 3 years playing together.Gombe National Park, Tanzania.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Fifty' aged 3 years portrait.Gombe National Park, Tanzania.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) alpha male 'Ferdinand' aged 20 years, females Nuru' aged 22 years and 'Nasa' aged 24 years calling. Gombe National Park, Tanzania. June 2012.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Gremlin' aged 41 years grooms her daughter 'Golden' aged 14 years while their infants 'Gizmo' aged 3 years and 'Glamma' aged 9 months sit b...

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) young baby of adolescent female 'Golden' suckling. Gombe National Park, Tanzania.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) male 'Faustino' aged 22 years walking along a track preparing to display. Gombe National Park, Tanzania.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) adult male 'Frodo' aged 35 years portrait. Gombe National Park, Tanzania.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Gremlin' aged 40 years holding her daughter 'Glitter's' baby daught aged 2 months and her own infant son aged 2 years. With 'Glitter' aged...

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Gremlin' aged 40 years holding female baby aged 2, her granddaughter. Gombe National Park, Tanzania. Gremlin took the new born baby from he...

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Gizmo' aged 2 years lying on the forest floor. Gombe National Park, Tanzania.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Gizmo' aged 2 years, portrait. Gombe National Park, Tanzania.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Google' aged 2 years, portrait. Gombe National Park, Tanzania.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Gremlin' aged 40 years calling while holding her baby granddaughter aged 2 months and her own infant son aged 2 years. Gombe National Park,...

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) male 'Freud' aged 40 years head portrait. Gombe National Park, Tanzania.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant female 'Safi' aged 2 years with female 'Nasa' aged 23 years. Gombe National Park, Tanzania.

Konrad Wothe / Male Chimpanzees (Pan troglodytes) attacking the alpha male of their troop, Mahale Mountains National Park, Tanzania.

Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.

Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, with a baby in the background, Mahale Mountains National Park, Tanzania.

Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.

Konrad Wothe / Chimpanzees (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.

Konrad Wothe / Chimpanzee (Pan troglodytes) sitting in the rain, Mahale Mountains National Park, Tanzania.

Jabruson / Chimpanzee (Pan troglodytes schweinfurthii) in cage, confiscated from poachers, housed in Epulu, Okapi Wildlife Reserve, Orientale Province, North-East, Democratic Republic of Congo

Jabruson / Young Chimpanzee in fruiting fig tree (Pan troglodytes schweinfurthii) Tongo, Virunga National Park, Kivu, Democratic Republic of Congo

Anup Shah / Eastern common chimpanzee male 'Bonobo' {Pan troglodytes schweinfurtheii} sitting on branch Mahale NP, Tanzania.

Anup Shah / Eastern common chimpanzee baby {Pan troglodytes schweinfurtheii} Mahale NP, Tanzania.

Anup Shah / Eastern common chimpanzee male 'Alouf' {Pan troglodytes schweinfurtheii} in tree eating leaves with meat, Mahale NP, Tanzania

Anup Shah / Eastern common chimpanzee {Pan troglodytes schweinfurtheii} lying on ground, Mahale NP, Tanzania

Cyril Ruoso / Eastern Chimpanzee (Pan troglodytes schweinfurthii) , Frodo the dominant male and hunter, eating a Red River Hog (Potamochoerus porcus) piglet with two females begging, Gombe National Park, Tanzania

Cyril Ruoso / Eastern Chimpanzee (Pan troglodytes schweinfurthii) eating leaves, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sixteen month old baby female, named Gossamer, in tree, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, playing with her three year old brother, named Fifty, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) fifteen year old mother carrying her twenty-one month old daughter, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) mother, twenty-three years old, holding less than one day old newborn, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, five years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) female, thirteen years old, playing with her two month old baby daughter, Gombe National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) mother with baby, Gombe Stream National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) mother with baby, Gombe Stream National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) baby with mother grooming juvenile, Gombe Stream National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) baby hanging on branch, Gombe Stream National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) parent grooming juvenile feeding on fruit, Gombe Stream National Park, Tanzania

Thomas Marent / Eastern Chimpanzee (Pan troglodytes schweinfurthii) mother with baby, Gombe Stream National Park, Tanzania

Eric Baccega / Chimpanzee (Pan troglodytes schweinfurthii) male sitting in a tree. Kibale National Park, Uganda, Africa

Eric Baccega / Hand and foot of chimpanzee (Pan troglodytes schweinfurthii). Kibale National Park, Uganda, Africa