Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Fana' aged 54 years playing with her infant grandson 'Flanle' aged 3 years, Bossou Forest, Mont Nimba, Guinea. January 2011.

Duncan Murrell / Batak father, daughter and grandson in Sitio Kalakwasan, Cleopatra's Needle Critical Habitat, Palawan, the Philippines. October 2016.

Jack Dykinga / Grandmother and grandson standing next to Strangler fig (Ficus padifolia) covering the wall of their home, Aduana, near Alamos, Sonora, Mexico.

Jack Dykinga / Grandmother and grandson standing next to Strangler fig (Ficus padifolia) covering the wall of their home, Aduana, near Alamos, Sonora, Mexico 1992

Eric Baccega / Nenet elder with grandson dressed in winter coats, made from reindeer skin in tent. Yar-Sale district, Yamal, Northwest Siberia, Russia. April 2016.

Pete Oxford / Konyak Naga man with grandson, in house decorated with buffalo skulls, Mon district, Nagaland, North East India, October 2014.

Enrique Lopez-Tapia / Elderly Borona woman, with her young grandson. Ethiopia, November 2014

Enrique Lopez-Tapia / Elderly Borona woman, with her young grandson. Ethiopia, November 2014

Enrique Lopez-Tapia / Elderly Borona woman, with her young grandson. Ethiopia, November 2014

David Tipling / Roost of around 800 Pied Wagtails (Motacilla alba) in trees outside Terminal 5 Heathrow, London, UK. December 2013.

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Fana' aged 54 years protecting her grandson 'Flanle' aged 3 years from an aggressive female 'Yo' aged 49 years who is angry at a juvenile female 'J...

Anup Shah / Western chimpanzee (Pan troglodytes verus) female 'Fana' aged 54 years playing with her infant grandson 'Flanle' aged 3 years, Bossou Forest, Mont Nimba, Guinea. January 2011.