Pete Cairns / Domestic chicken / hen {Gallus gallus domesticus), Black Rock strain roaming free range on Scottish farm, Scotland, UK

Constantinos Petrinos / Man attaching blades to rooster's {Gallus gallus domesticus} leg for cock fighting, North Sulawesi, Indonesia 2000.

Constantinos Petrinos / Illegal Cock fighting 'game', Northern Sulawesi, Indonesia. Note - roosters have knives on their legs 2000.

Constantinos Petrinos / Man holding rooster {Gallus gallus domesticus} for illegal cock fighting, Northern Sulawesi, Indonesia. Note - knives attached to rooster's legs 2000.

John Downer / Man watching cock {Gallus gallus domesticus} fighting, Bali, Indonesia

John Downer / Cock {Gallus gallus domesticus} fighting, Bali, Indonesia

John Downer / Cock {Gallus gallus domesticus} fighting, Bali, Indonesia

John Downer / Cock {Gallus gallus domesticus} fighting, Bali, Indonesia

LYNN M. STONE / Domestic chicken {Gallus gallus domesticus} rooster amongst Daffodils, USA

LYNN M. STONE / Domestic chicken {Gallus gallus domesticus} rooster amongst Daffodils, USA

LYNN M. STONE / Domestic chicken {Gallus gallus domesticus} amongst Daffodils, USA

LYNN M. STONE / Domestic chicken, chick {Gallus gallus domesticus} amongst Pansies, USA

George McCarthy / Domestic Chicken {Gallus gallus domesticus} cockerel, Lesvos, Greece

Bjorn Forsberg / Domestic chicken in hen run {Gallus gallus domesticus} Sweden

GEORGETTE DOUWMA / Adult cock / rooster head profile with fully developed wattle and comb, UK. Hen

GEORGETTE DOUWMA / Chickens {Gallus gallus domesticus} in hen house, UK.

Simon Colmer / Light Sussex free range Domestic chicken / hen {Gallus gallus domesticus} UK

LYNN M. STONE / Domestic chicken, Americana breed {Gallus gallus domesticus} USA.

GEORGETTE DOUWMA / Domestic chicken {Gallus gallus domesticus} rooster and hen. UK

GEORGETTE DOUWMA / Domestic chicken sitting {Gallus gallus domesticus} UK

Jane Burton / Domestic chicken, White leghorn cockerel crowing.

Tony Heald / Red junglefowl cock {Gallus gallus} Bandhavgarh NP, India.

Jane Burton / Portrait of a chick {Gallus gallus domesticus} 3-week-old

Jane Burton / Yellow chick {Gallus gallus domesticus}

Jane Burton / Light Sussex Bantam Hen {Gallus gallus domesticus} and chicks drinking

Jane Burton / Young cockerel {Gallus gallus domesticus} with comb and wattles turning pink

Jane Burton / Light Sussex Bantam cockerel {Gallus gallus domesticus} crowing.

Jane Burton / Yellow chick {Gallus gallus domesticus} Day-old with its own eggshell.

Jane Burton / Light Sussex Bantam Hen {Gallus gallus domesticus} with her hatchling chicks

Jane Burton / Day-old yellow chick {Gallus gallus domesticus}

Jane Burton / Yellow chick {Gallus gallus domesticus} with a piece of eggshell

Jane Burton / Day-old yellow chick {Gallus gallus domesticus}

Jane Burton / Bantam chick {Gallus gallus domesticus} hatching. The chick heaves the cracked shell apart.

Jane Burton / Light Sussex bantam chick {Gallus gallus domesticus} hatching from the egg. Sequence 5/6 Quickly the chick kicks itself free of the shell as it turns the right way up.

Jane Burton / Light Sussex hen {Gallus gallus domesticus} defending chicks from Common Rat {Rattus norvegicus}

Jane Burton / 2-day-old chicks {Gallus gallus domesticus} finding wheat grains among straw, with hatched eggshells.

Jane Burton / Profile of yellow chick {Gallus gallus domesticus}

Jane Burton / Light Sussex Bantam Hen {Gallus gallus domesticus} with 2-day-old chicks, drinking at puddle.

Jane Burton / Cockerel chicks {Gallus gallus domesticus} drinking. 5-days-old

Jane Burton / Light Sussex Bantham Hen {Gallus gallus domesticus} pointing to show her week-old chicks food (chick crumbs)

Jane Burton / Light Sussex Bantam chick {Gallus gallus domesticus} hatching from the egg. 1/6 The chick has pipped a large hole in the shell and now rests a while.

Jane Burton / The birth of a hen chick {Gallus gallus domesticus} sequence 1/8 The chick tries to straighten out, it heaves the cap off egg shell.

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 3/9. The chick begins to push the two halves of the shell apart

Jane Burton / Light Sussex Bantam chick {Gallus gallus domesticus} hatching from the egg. Sequence 2/6 The chick has cut most of the way round the shell as it turns

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 4/9. The chick heaves the shell apart

Jane Burton / Light Sussex Bantam chick {Gallus gallus domesticus} hatching from the egg. Sequence 3/6 By trying to straighten its neck, the chick forces open the shell

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 5/9. The chick kicks its way out of the larger part of the shell

Jane Burton / Light Sussex bantam chick {Gallus gallus domesticus} hatching from the egg. Sequence 4/6 Suddenly the chick's neck straightens and the 'lid' of the shell flies open.

Jane Burton / Buff Orphington hen {Gallus gallus domesticus} brooding her nine, 2-day-old chicks - five still out

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 6/9. The hatchling chick, its down still wet, cheeps as it lifts its head

Jane Burton / Buff bantam hen {Gallus gallus domesticus} with her chicks, 2-days-old.

Jane Burton / Light Sussex bantam chick {Gallus gallus domesticus} hatching from the egg. Sequence 6/6 Just hatched the chick rests while its down dries and its legs become strong.

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 7/9. The chick sitting up, still damp.

Jane Burton / Bantam hen {Gallus gallus domesticus} brooding her day-old chicks

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 1/9. The chick rests with its beak in the hole.

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 8/9. The three-day-old chick runs strongly enough to follow its mother and find food.

Jane Burton / Buff bantam Hen {Gallus gallus domesticus} with chicks, 2-days-old.

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 2/9. The hatching chick has almost cut the egg shell into two

Jane Burton / Buff Pekin {Gallus gallus domesticus} hatch sequence 9/9. The day-old-chick can stand up but not very steadily.

Jane Burton / Buff bantam hen {Gallus gallus domesticus} with chicks, 2-days-old, eating chick crumbs.

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 2/8. At the moment of hatching the chick's struggles roll it onto its back.

Jane Burton / Broody Light Sussex bantam hen {Gallus gallus domesticus} with chick

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 3/8. After struggling the right way up the chick will now rest and dry its down.

Jane Burton / Light Sussex hen {Gallus gallus domesticus} and chicks pecking grain

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 4/8. Several hours-old the chick's down is almost dry and it can shuffle about

Jane Burton / Eggshell {Gallus gallus domesticus} after chick has hatched

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 5/8. The day-old-chick can stand upright, run about and feed itself.

Jane Burton / Broken eggshell {Gallus gallus domesticus} after chick has hatched

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 6/8. The day-old-chick can stand upright, run about and feed itself.

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 7/8. Chick one-week-old

Jane Burton / Profile of yellow chick standing {Gallus gallus domesticus}

Jane Burton / Light Sussex hen chick {Gallus gallus domesticus} birth sequence 8/8. Chicken ten-days-old

LYNN M. STONE / Silver pencilled wyandotte domestic chicken pair {Gallus g domesticus} in snow, USA.

LYNN M. STONE / Blue orpington domestic chicken pair {Gallus g domesticus} in snow, USA.

LYNN M. STONE / Blue orpington domestic chicken {Gallus g domesticus} in snow, USA.

LYNN M. STONE / Red Dorking domestic chicken male {Gallus g domesticus} Iowa, USA.

Nick Garbutt / Male Lance nosed chameleon {Calumma gallus} CE Rainforest, Madagascar

Nick Garbutt / Male Lance nosed chameleon {Calumma gallus} CE Rainforest, Madagascar

Jane Burton / Bantam eggs. UK.

Philippe Clement / Domestic cock with hen, Leghorn alricoos breed, Belgium

Philippe Clement / Domestic hen, Labelroos breed {Gallus gallus domesticus} Belgium

DAVID TIPLING / Red junglefowl {Gallus gallus} Bandhavgarh NP, India. Ancestor of domestic chicken

Dan Burton / Cockerel perched on fence - rare breed, five toed silver Dorking

Jane Burton / Chicken egg with point of hatch chick dead in shell. UK.

Jane Burton / Domestic hen's egg {Gallus gallus domesticus} , showing embyro after 72 hours, UK.

Jane Burton / Cockerel / Rooster {Gallus gallus domesticus} crowing. Captive, UK.

Jane Burton / Hands applying pressure to strongest part of hen's egg - resists crushing.

Mitsuaki Iwago / Domestic Chicken (Gallus domesticus) with group of chicks, North America

Mitsuaki Iwago / Domestic Chicken (Gallus domesticus) group in cages at commercial poultry farm, North America

Mitsuaki Iwago / Domestic Chicken (Gallus domesticus) male crowing, North America

Mitsuaki Iwago / Domestic Chicken (Gallus domesticus) male with extremely long tail feathers, Japan

Heidi & Hans-Juergen Koch / Domestic Chicken (Gallus domesticus) chick hatching from egg in nest, northern Germany

Heidi & Hans-Juergen Koch / Domestic Chicken (Gallus domesticus) chick hatching from egg in nest, northern Germany

Heidi & Hans-Juergen Koch / Domestic Chicken (Gallus domesticus) chick hatching from egg in nest, northern Germany

Heidi & Hans-Juergen Koch / Domestic Chicken (Gallus domesticus) chick hatching from egg in nest, northern Germany