Juan Manuel Borrero / Sweet chestnut tree {Castanea sativa} Las Medulas National Park, Leon, Spain

Juan Manuel Borrero / La Cuevona cave. Roman gold mine. Las Medulas National Park, Leon, Spain

Philippe Clement / Sweet chestnuts {Castanea sativa} Belgium

Philippe Clement / Close up of bark of Sweet chestnut tree {Castanea sativa} Belgium

Philippe Clement / Sweet chestnuts {Castanea sativa} Belgium

Jan Vermeer / European Chestnut (Castanea sativa) open fruit detail, southern Europe, north Africa and Asia

Jan Vermeer / European Chestnut (Castanea sativa) open and closed fruit with mushrooms on forest floor, southern Europe, north Africa and Asia

Will Watson / Ancient Sweet chestnut tree {Castanea sativa} with limited new growth, UK

Colin Varndell / Sweet chestnut tree {Castanea sativa} in field of Linseed in flower. UK

Jose B. Ruiz / Sweet chestnut branches + fruit (Castanea sativa) Asturias Spain Muniellos Biological Reserve

Mike Read / White faced nunbirds, {Hapaloptila castanea} one with tick under beak, Ecuador, South America

Jose B. Ruiz / Sweet chestnut branches + fruit (Castanea sativa). Muniellos Biological Reserve, Asturias, Spain, Europe

Mike Read / Path through woodland with Sweet chestnut trees (Castanea sativa), Backley Inclosure, New Forest National Park, Hampshire, UK, October 2010

Mike Read / Sweet chestnut (Castanaea sativa) trees in autumn mist, Backley Inclosure, New Forest National Park, Hampshire, UK, October

Pascal Tordeux / Sweet Chestnut / Chinkapin (Castanea sativa). Picardy, France, June.

Steve Gettle / Bay-breasted Warbler (Setophaga castanea) male carrying insect prey, Crane Creek State Park, Ohio

Murray Cooper / Bay-breasted Warbler (Setophaga castanea) male, Colombia

Ingo Arndt / Buttress roots of chestnut tree, Christmas Island, Indian Ocean, Territory of Australia

George McCarthy / Sweet chestnut coppiced trees {Castanea sativa} Kent UK