John Shaw / Chestnut-eared aracari (Pteroglossus castanotis) on cat-gut vine. Pantanal, Brazil, August.

Graeme Guy/ BIA / Chestnut-headed Bee-eater (Merops leschenaulti) trio with insect prey, Penang, Malaysia

Glenn Bartley/ BIA / Chestnut-bellied Cuckoo (Hyetornis pluvialis) calling, Jamaica

Piotr Naskrecki / Chestnut Short-tailed Bat (Carollia castanea) flying, La Selva Biological Reserve, Costa Rica

Chien Lee / Chestnut-capped Laughingthrush (Garrulax mitratus), Kinabalu National Park, Sabah, Malaysia

Bence Mate / White-throated Mountain Gem (Lampornis castaneoventris), Green-crowned Brilliant (Heliodoxa jacula) group of three with one in flight, Savegre, Costa Rica

Niall Benvie / Queen Mary's Tree, a veteran Sweet chestnut (Castanea sativa) over 600 years old, Cumbernauld, Scotland, UK, July.

Juan Carlos Munoz / Ferns growing near fallen tree in Chestnut forest, Onati, Gipuzkoa, Basque Country, Spain, Europe

Rob Drummond / Chestnut Teal (Anas castanea) male, Victoria, Australia

Graeme Guy / Chestnut-headed Bee-eater (Merops leschenaulti) male, Penang, Malaysia

Dong Lei / Chestnut-headed Tesia (Tesia castaneocoronata) perched, Sichuan Province, China.

Jan Wegener / Chestnut Teal (Anas castanea) male, Victoria, Australia

Glenn Bartley / Chestnut-mandibled Toucan (Ramphastos swainsonii), Costa Rica

Jan Wegener / Chestnut Teal (Anas castanea) drake, Australia

Gary K. Smith / Woodland floor with purple fungi Amethyst Deceiver (Laccaria amethystina), and fallen seed cases and fruit of Sweet Chestnut tree (Castanea savita) Norfolk, UK, October

Carol Walker / Arabian stallion, chestnut, portrait, Ojai, California, USA

Sue Flood / Chestnut mandibled toucan (Ramphastos ambiguus swainsonii) near Boca Tapada, Costa Rica. January 2011

Terry Whittaker / 2020VISION / Hazel dormouse (Muscardinus avellanarius), Chestnut coppice and Bluebells (Hyacinthoides non-scripta). Careful chestnut and hazel coppicing benefits dormice. Kent, UK, April 2011

Terry Whittaker / 2020VISION / Hazel dormouse (Muscardinus avellanarius) running up branch in coppiced hazel tree, Kent, UK. Photographed in wild under licence with remote camera (camera trap), October

Terry Whittaker / 2020VISION / Hazel dormouse (Muscardinus avellanarius) in coppiced hazel tree, Kent, UK. Photographed in wild under licence with remote camera (camera trap), September. 2020VISION Book Plate.

Terry Whittaker / 2020VISION / Hazel dormouse (Muscardinus avellanarius), Kent, UK. Members of Kent Mammal Group conduct monthly dormouse survey, torpid dormouse hibernating in nest box in coppiced woodland, November 2011. Did you...

Eric Baccega / Comtois Horse (Equus caballus). Camargue reserve, Rhone, France, September.

Carol Walker / Chestnut Paso peruvian stallion running, California, USA

Carol Walker / Chestnut arabian stallion running, California, USA

Kristel Richard / Feral domestic horses (Equus caballus) wild herd stallion (grey) fighting a bachelor chestnut stallion, Blue Swallow Reserve, near Kaapsehoop, Mpumalanga province / Eastern Transvaal, South Africa, O...

Ernie Janes / Suffolk Punch heavy horses in field, UK, September

Angelo Gandolfi / Ancient Sweet Chestnut trees (Castanea sativa) growing in the Spelunca Gorges. Porto, Parc Naturel Regional de Corse, Corsica island, France, January 2010

Kristel Richard / Three chestnut Quarter mares running in open field, Morocco, June 2010

Steve Gettle / Chestnut-sided Warbler (Setophaga pensylvanica) male, Crane Creek State Park, Ohio

Mary McDonald / Chestnut-mandibled Toucan (Ramphastos ambiguus swainsonii) adult bird perched on the edge of the forest. Laguana del Lagarto, Costa Rica, Central America.

Hanne & Jens Eriksen / Arabian gazelle {Gazella gazella} and Chestnut-bellied sandgrouse {Pterocles exustus} drinking from pool of water, Oman

Andy Sands / Bank vole (Clethrionomys glareolus) holding Sweet Chestnut seed in Autumn, Captive, UK.

Angelo Gandolfi / Las Medulas, Cordillera Cantabrica, Castilla y Leon, Spain. The landscape, now a natural reserve, is man-made: the rock formations are the result of iron mining since Roman times and the wood is culti...

Wild Wonders of Europe / Radisics / Water caltrop / chestnut (Trapa natans) plants growing on water surface, Lake Skadar, Lake Skadar National Park, Montenegro, May 2008

Wild Wonders of Europe / Radisics / Water caltrop / chestnut (Trapa natans) on water surface, Lake Skadar, Lake Skadar National Park, Montenegro, May 2008

Donald M. Jones / Chestnut-backed Chickadee (Poecile rufescens) on Ponderosa Pine (Pinus ponderosa) cone, western Montana

Juan Carlos Munoz / Chestnuts from Sweet chestnut tree {Castenea sativa} Redes NP, Asturias, Northern Spain, October 2007

Donald M. Jones / Chestnut-backed Chickadee (Poecile rufescens) in winter on berries, western Montana

Rolf Nussbaumer / Chestnut-Breasted Coronet hummingbird (Boissonneaua matthewsii) adult feeding from fuchsia flower, Papallacta, Ecuador, Andes, South America, January

Andrew Parkinson / Grey squirrel {Sciurus carolinensis} adult standing alert among the fallen leaves of Horse Chestnut tree, Derbyshire, UK

Pete Oxford / Chestnut-mandibled Toucan (Ramphastos swainsonii), Choco Forest, Ecuador

Jose B. Ruiz / Sweet chestnut saplings, San Martin de Trevejo, Las Hurdes, caceres, Extremadura, Spain

Elio Della Ferrera / Chestnut naped francolin {Pternistis castaneicollis} Ethiopian highlands, Ethiopia

Hanne & Jens Eriksen / Chestnut bellied sandgrouse male drinking {Pterocles exustus} Jaaluni, Oman

Geoff Simpson / Horse chestnut tree sticky bud opening {Aesculus hippocastanum} England

Rolf Nussbaumer / Chestnut sided warbler {Dendroica pennsylvanica} Texas, USA

Hanne & Jens Eriksen / Chestnut bellied sandgrouse {Pterocles exustus} male, collecting water in feathers, Jaaluni, Oman

Georgette Douwma / Grey squirrel {Sciurus carolinensis} feeding on sweet chestnut nuts, Regents Park, London, UK

Neil Lucas / Chestnut mandibled toucan, Panama, Central America

Hermann Brehm / Chestnut eared aracari {Pteroglossus castanotis} Peru

Nigel Cattlin / Horse chestnut leaf miner (Cameraria ohridella) larval damage to Horse chestnut (Aesculus hippocastanum) leaves. Berkshire, England, UK. August.

Staffan Widstrand / Wild Wonders of China / Chestnut thrush (Turdus rubrocanus) Kanding, Sichuan, China

Staffan Widstrand / Wild Wonders of China / Chestnut-crowned laughingthrush (Trochalopteron erythrocephalum) Gaoligong Nature Reserve, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Chestnut-crowned laughingthrush (Trochalopteron erythrocephalum) Gaoligong Nature Reserve, Yunnan, China

Martin Willis / Chestnut-breasted Munia (Lonchura castaneothorax), Yellow-rumped Munia (Lonchura flaviprymna), and Star Finches (Neochmia ruficauda) drinking, Kimberley, Western Australia, Australia

Dong Lei / Verreaux's monal partridge (Tetraophasis obscurus). Jiudingshan Nature Reserve, Mao Country, Sichuan Province, China. November.

Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) male. Ndutu, Tanzania.

Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) pair in flight. Meru National Park, Kenya.

Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) male soaking feathers to provide chicks at nest with water. Meru National Park, Kenya.

Tony Heald / Chestnut Arabian horse, portrait. Namibia.

Tony Heald / Chestnut Arabian horse trotting. Namibia.

Tony Heald / Chestnut Arabian horse cantering. Namibia.

Tony Heald / Chestnut Arabian horse cantering with dust flying. Namibia.

Tony Heald / Chestnut Arabian horse standing. Namibia.

Tony Heald / Chestnut Arabian horse galloping, in mid-air. Namibia.

Tony Heald / Chestnut Arabian horse, portrait. Namibia.

David Tipling / Chestnut-bellied monarch (Monarcha castaneiventris) perched in tree. Nara, Makira, Solomon Islands.

Ingo Arndt / Chestnut-breasted coronet (Boissonneaua matthewsii) perched on branch. Ecuador.

Ernie Janes / Horse chestnut (Castanea sativa) new leaves.

Heather Angel / Bumblebee (Bombus sp) nectaring on Indian horse chestnut flower (Aesculus indica). Yellow spots on banner petals turn pink as nectar resource declines. Orange pollen is pick ed up on wings and thorax...

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

Ernie Janes / Sweet chestnut (Castanea sativa) trunk and bark patterns of ancient tree, Norfolk, England, UK, November.

John Shaw / Black-collared hawk (Busarellus nigricollis) flyinfg with fish it has caught in its talons. Backwater of the Rio Claro, Pantanal, Brazil. August.

Bernard Castelein / Chestnut-eared Aracari (Pteroglossus castanotis) Pampas del Yacuma Protected Area, Bolivia

Bernard Castelein / Black-collared hawk (Busarellus nigricollis), Pampas del Yacuma Protected Area, Bolivia

Bernard Castelein / Black-collared hawk (Busarellus nigricollis), Pampas del Yacuma Protected Area, Bolivia

David Pattyn / Chestnut breasted coronet hummingbird, (Boissonneaua matthewsii) perched on branch, , Guango reserve, Mindo, Ecuador, July

David Pattyn / Chestnut crowned antpitta (Grallaria ruficapillas), Mindo, Pichincha, Ecuador, July

David Pattyn / Chestnut crowned Antpitta (Grallaria ruficapillas), Mindo, Pichincha, Ecuador, July

Markus Varesvuo / Chestnut-winged cuckoo (Clamator coromandus) perched in tree. Happy Island, Hebei Province, China. May.

David Tipling / Western jackdaw (Corvus monedula) flying with Sweet chestnut (Castanea sativa) in beak. Richmond Park, London, England, UK. October.

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

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

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

Nick Upton / Horse Chestnut (Aesculus hippocastanum) flower candelabras Wiltshire, UK, May.

Donald M. Jones / Chestnut-backed Chickadee (Poecile rufescens) at nest cavity, Troy, Montana

Thomas Marent / Chestnut-crowned Antpitta (Grallaria ruficapilla), Rio Blanco Nature Reserve, Colombia

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

Graeme Guy/ BIA / Chestnut-headed Bee-eater (Merops leschenaulti) pair with butterfly prey, Penang, Malaysia

Graeme Guy/ BIA / Chestnut-headed Bee-eater (Merops leschenaulti) pair jumping, Penang, Malaysia

Glenn Bartley/ BIA / Chestnut-bellied Cuckoo (Hyetornis pluvialis), Jamaica

Sandesh Kadur / Chestnut breasted coronet (Boissonneaua matthewsii) taking off from a branch, Ecuador.

Sandesh Kadur / Glowing puffleg (Eriocnemis vestita) feeding from a bird feeder, replaced by a Chestnut breasted coronet (Boissonneaua matthewsii), Ecuador.

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish prey (Loricariidae) attacked by Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish (Loraciidae) attacked by a Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..