David Tipling / Grey squirrel (Sciurus carolinensis) collecting sweet chestnuts (Castanea sativa) to cache for winter, Richmond Park, London, England, UK. October.

Colin Varndell / Sweet chestnut (Castanea sativa) seeds and seed case on ground, Dorset, England, UK.

Matthew Maran / Veteran sweet chestnut (Castanea sativa) approaching 200 years of age. Devon, England, UK, November.

Matthew Maran / Veteran sweet chestnut (Castanea sativa) approaching 200 years of age. Devon, England, UK, November.

Ernie Janes / Horse chestnut (Castanea sativa) tree conkers / seeds, Norfolk, England, UK, September.

Ernie Janes / Sweet chestnut (Castanea sativa) leaves and fruits in autumn, Norfolk, England, UK, August.

Gary K. Smith / Sweet chestnut (Castanea sativa) close up of tree trunk and bark. England, UK. September

Angelo Gandolfi / Giant ancient Chestnut tree (Castanea Sativa) with woman, Sila Greca, Sila National Park, Parco Nazionale della Sila UNESCO World Heritage Site, Calabria, Italy, June.

Angelo Gandolfi / Ancient Chestnut tree (Castanea Sativa). Sila Greca, Sila National Park, Calabria, Italy, June.

Angelo Gandolfi / Woman standing in hollow of ancient Chestnut tree (Castanea Sativa). Sila Greca, Sila National Park, Parco Nazionale della Sila UNESCO World Heritage Site, Calabria, Italy, June.

Angelo Gandolfi / Chestnut tree (Castanea Sativa) at night, Sila Greca, Sila National Park, Calabria, Italy, June.

Angelo Gandolfi / Giant Chestnut tree (Castanea Sativa). June, Sila Greca, Sila National Park, Calabria, Italy