TJ Rich / Four chocolate working cocker spaniels on wall. Mother and offspring. Monmouth, Monmouthshire, Wales

Georgette Douwma / Chocolate chip sea star o (Protoreaster nodosus) on sandy bottom. Mabul, Malaysia.

Mark Taylor / Cute chocolate Toy Goldendoodle puppy in play-bow.

Petra Wegner,Petra Wegner / British Shorthair Cat with chocolate coat

David Noton / Chocolate Hills, Bohol, The Visayas, Philippines. February 2011.

Jane Burton / Chocolate registered Border Collie dog, 9 months.

Jane Burton / Chocolate Labrador Retriever puppy, sitting and looking up.

Mark Taylor / Chocolate Labrador puppy, 3 months, lying.

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris)

Petra Wegner / Sacred Cat of Burma / Birman, chocolate-point coated, portrait sitting on log in snow, with picket fence behind

Mark Taylor / Chocolate roan Cocker Spaniel puppy, Topaz, 12 weeks, running with ears flapping

Tim Laman / Chocolate Hills on Bohol Island, Philippines, November 2001.

Jane Burton / Domestic cat, 6-month chocolate Persian cross female 'Chloe'

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris) adult portrait

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris) portrait of a puppy sitting next to blooming chives in herb garden

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris) adult portrait

Phil Savoie / Chocolate mining bee (Andrena scotica) feeding on Dandelion (Taraxacum offinicale) Monmouthshire, Wales, UK. May

Phil Savoie / Chocolate mining bee (Andrena scotica) feeding on Dandelion (Taraxacum offinicale) Monmouthshire, Wales, UK. May

Phil Savoie / Chocolate mining bee (Andrena scotica) female outside riverbank burrow, Monmouthshire, Wales, UK. May

TJ Rich / Golden cocker spaniel puppy and Chocolate sprocker spaniel playing in armchair with toy. Wirral, England, UK.

TJ Rich / Chocolate sprocker spaniel lying down, portrait. Wirral, England, UK.

Ernie Janes / Cacao tree (Theobroma cacao) showing fruit pod

Ernie Janes / Cacao tree (Theobroma cacao) pod opened showing cacao beans.

Ernie Janes / Cacao tree (Theobroma cacao) fruit pod

Robert Thompson / Scarce chocolate tip moth (Clostera anachoreta) Turzovka, Cadca district, Slovakia.

Robert Thompson / Scarce chocolate tip moth (Clostera anachoreta) Turzovka, Cadca district, Slovakia.

Robert Thompson / Scarce chocolate tip moth (Clostera anachoreta) Turzovka, Cadca district, Slovakia.

Mark Raycroft / Yellow Labrador Retriever (Canis familiaris), Chocolate Labrador Retriever (Canis familiaris), and Black Labrador Retriever (Canis familiaris), North America

Mark Raycroft / Yellow Labrador Retriever (Canis familiaris), Chocolate Labrador Retriever (Canis familiaris), and Black Labrador Retriever (Canis familiaris), North America

Tim Fitzharris / Chocolate Hills, limestone covered in grass reaching up to 164 feet high, Bohol Island, Philippines

Tim Fitzharris / Chocolate Hills, limestone covered in grass reaching up to 164 feet high, Bohol Island, Philippines

Phil Savoie / Chocolate mining bee (Andrena scotica), feeding on Dandelion (Taraxacum officinale) flower, Monmouthshire, Wales, UK, May.

Phil Savoie / Chocolate mining bee (Andrena scotica), feeding on Dandelion (Taraxacum offinicale) Monmouthshire, Wales, UK. May

TJ Rich / Two young Labrador retrievers, black (male) and chocolate (female), Somerset, UK

TJ Rich / Chocolate working cocker spaniel running with ball. Clevedon, Somerset, UK

TJ Rich / Chocolate working cocker spaniel in Chesterfiel arm chair. Winchester, Hampshire, UK

TJ Rich / Chocolate working cocker spaniel in Chesterfield armchair, Winchester, Hampshire, UK

TJ Rich / Chocolate working cocker spaniel amongst sand dunes. Formby, Merseyside, UK

TJ Rich / Chocolate working cocker spaniel sleeping amongst sand dunes. Formby, Merseyside, UK

TJ Rich / Chocolate working cocker spaniel in beech woodland, Erlestoke woods, Salisbury Plain, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel in snowdrops, North Newton, Wiltshire, UK

TJ Rich / Chocolate cocker spaniel in snowdrops, North Newton, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel in snow, Wiltshire, UK

Gary Bell/ Oceanwide / Clark's Anemonefish (Amphiprion clarkii) juvenile in sea anemone, Papua New Guinea

Pascal Kobeh / Mole cowry or chocolate banded cowry (Talparia talpa / Cypraea talpa) with its mantle covering it, at night, Sulu Sea, Philippines.

Pedro Narra / Cocoa plant (Theobroma cacao) fruit in plantation, Principe Island, Democratic Republic of Sao Tome and Principe,

Pedro Narra / Cocoa plant (Theobroma cacao) fruit in plantation, Principe Island, Democratic Republic of Sao Tome and Principe,

Claudio Contreras / Cacao (Theobroma cacao) fruit, Oaxaca, southern Mexico, December

Georgette Douwma / Mimic surgeonfish (Acanthurus pyroferus). North Sulawesi, Indonesia.

Lynn M. Stone / Chocolate labrador retriever, two puppiessitting in spring flowers. Haddam, Connecticut, USA. June.

Lynn M. Stone / Chocolate labrador retriever, adult and puppy in Common bluet (Houstonia caerulea) field. Haddam, Connecticut, USA. May.

Lynn M. Stone / Chocolate labrador retriever, two puppies lying in Common bluet (Houstonia caerulea) field. Haddam, Connecticut, USA. May.

Lynn M. Stone / Chocolate labrador retriever puppy lying in Common bluet (Houstonia caerulea) field. Haddam, Connecticut, USA. May.

Mark Taylor / Chocolate point cat.

Mark Taylor / Chocolate point cat.

Mark Taylor / Chocolate Labradoodle puppies.

Mark Taylor / Chocolate and golden labradoodle puppies. These puppies are both age 6 weeks, but the smaller one is a runt.

Mark Taylor / Chocolate labradoodle puppies.

Mark Taylor / Chocolate point cat.

Mark Taylor / Chocolate point cat rolling playfully.

Mark Taylor / Chocolate point cat standing and looking round.

Mark Taylor / Chocolate point cat standing up.

Mark Taylor / Cavalier King Charles Spaniel and Chocolate Dachshund puppy.

Mark Taylor / Chocolate Cocker Spaniel puppy sitting,

Mark Taylor / Chocolate brown Pomeranian puppy in play-bow.

Robin Chittenden / Boy observing Black slug (Arion ater), brown form. Norfolk, UK. September 2017.

TJ Rich / Chocolate Working Cocker Spaniel sitting among Wild Garlic (Ramsons) and Bluebells, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel resting among crocuses, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel sitting next to Kennet and Avon Canal in winter, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel male portrait, Hampshire, UK

TJ Rich / Chocolate working cocker spaniel male portrait, Hampshire, UK

TJ Rich / Chocolate working cocker spaniel sitting among field stubble with blue sky and clouds, Wiltshire, UK

TJ Rich / Chocolate working cocker spaniel portrait sitting in lavender fields, Gloucestershire, UK

TJ Rich / Chocolate working cocker spaniel portrait sitting in lavender fields, Gloucestershire, UK

TJ Rich / Chocolate working cocker spaniel in wild garlic (Ransoms) and Bluebells, Wiltshire, UK

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris), North America

Mark Raycroft / Chocolate Labrador Retriever (Canis familiaris), North America

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with flowers, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with flowers, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pods, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pod, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pod, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with flowers, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pod, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pod, Costa Rica.

Phil Savoie / Cacao / Chocolate (Theobroma cacao) plant with ripening seed pod, Costa Rica.

Lynn M. Stone / Three breed colors of Labrador Retriever - black, chocolate and golden - standing in water, Rhode Island, USA. August.

Lynn M. Stone / Black and chocolate Labrador Retrievers playing with toy in bay, Charlestown, Rhode Island, USA. Non-ex.

Lynn M. Stone / Labrador retriever, three different colours together, black, yellow, chocolate, at edge of salt marsh, Charlestown, Rhode Island, USA, June.

Alex Mustard / Detail of the pattern of a Bluelined grouper (Cephalopholis formosa). Richelieu Rock, Thailand. Andaman Sea, Indian Ocean.

Chris Mattison / Chocolate tip moth (Clostera curtula) Catbrook, Monmouthshire, Wales, UK. May.

Chris Mattison / Chocolate tip moth (Clostera curtula) on white background Catbrook, Monmouthshire, Wales, UK. May. Focus-stacked image.

Michael Hutchinson / Red slug (Arion rufus), Bristol, England, UK, September.

Ingo Arndt / Dusky slug (Arion rufus) with body extended, Germany, May.

Ingo Arndt / Dusky slug (Arion rufus) retracted for protection, Germany, May.