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Yokohama chickens at the scientific poultry center in Sinsteden, Germany.

Conservation Legacy · Chickens world

YokohamaLiving heritage.

A connected world for understanding, teaching and carrying forward yokohama—its history, characteristics, knowledge, people and future.

Living heritageThreatened2026 Conservancy list

The place and purpose behind the breed

A past that shaped a living population.

The Yokohama’s exhibition identity emphasizes flowing tails and refined carriage. Its appearance illustrates how generations of ornamental selection can produce a population with very specific feather-maintenance needs.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.
Photographic introduction · YokohamaOrnamental

Hagen Graebner · CC BY-SA 3.0 ↗

A connected world of its own

Enter the knowledge
behind yokohama.

Each chapter belongs to this population. Its library brings the original teaching and official sources together.

Inside this animal’s library

Read the stories.
Understand the animal.

Original articles connect this population’s history, traits and preservation with the evidence behind them.

Explore the full 3-article collection →
Original Conservation Legacy learning collection

Get to know Yokohama.

Read this breed’s history, traits and conservation story here. Each article includes the evidence behind it and links for further learning.

Open the Yokohama library →
Visual field guide

Size, details & appearance

Look closely at the features that make this animal distinctive.

Yokohama chickens at the scientific poultry center in Sinsteden, Germany.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.
Hagen Graebner · CC BY-SA 3.0 · License

Size reference

Male4.5–5.25 lbFemale3–3.5 lb07 lb
Male 4.5-5.25 lbs / Female 3-3.5Positions represent mass; intervals and point references follow their source descriptions. These references describe the breed, separately from the photographed individual.

Source-reported weight references ↗ · checked October 5, 2026.

Market weight and adult weight describe different stages. Values are reference information, not individual growth guarantees.

Use

Ornamental

Egg Color

White/Cream

Shell color can vary between individuals and through a laying season.

Egg Size

Small to Medium

Source-reported size category; not a measured weight for every egg.

Temperament

Active, alert

Evidence: breed account. Visual interpretation by Conservation Legacy. Weight interval diagrams show mass, not body proportions.
History & heritage1 expanded article
Original educational article

Long feathering within a defined silhouette

The society's British description emphasizes a long, deep body, abundant narrow saddle feathering and a low, flowing tail. Head requirements vary with the variety; its Red Saddled form does not use the single comb permitted in other British forms. This is why a single checklist detached from its variety can mislead. The standard describes the desired mature appearance, not a promise that every young bird will already display an adult tail.

Appearance & working traits2 expanded articles
Original educational article

Why Yokohama names differ between countries

The Rare Poultry Society explains that European imports of several Japanese long-tailed types were associated with the port of Yokohama. German fanciers later restricted Yokohama to a particular red-saddled form and used Phoenix for a white-lobed, single-combed type. British fanciers used Yokohama more broadly. Consequently, a British label may cover birds that another country's system separates. A teaching collection must specify that context instead of silently combining national identities.

Original educational article

Interpreting this population in practice

How its documented identity shapes learning and conservation.

Yokohama and Phoenix chickens share associations with Japanese long-tailed poultry but are distinct developed breeds. Teach their different form and selection histories rather than using the names interchangeably. Long feathers need practical care as well as admiration. Imported ancestral types, European development and present standardized populations should be described as separate stages.

Science & inheritanceFoundations & evidence
General species foundations

Scientific identity

Red junglefowl natural history supplies background on ground feeding and social relationships. Its species account discusses the wild bird, so wild habitat and life-history figures must not be applied to every domestic breed. Domestic flock behavior is also affected by space, individual birds and the way groups are managed.

Chickens forage for plant foods and small animals, but access to insects does not establish a complete diet. Growing birds and laying birds have different nutritional roles. Litter, ventilation and drinking water are biological conditions: wet bedding and accumulated ammonia can damage welfare. A breed's reputation for hardiness should sit alongside this basic husbandry explanation.

Landscapes & adaptationFoundations & evidence
General species foundations

Ecology & human landscapes

A chicken flock occupies a human-managed habitat that connects soil, insects, vegetation, manure and feed brought onto the farm. Teaching should describe those connections without promising that birds eliminate every pest or enrich every site automatically. The scale and management of the flock shape the outcome.

Conservation adds a second layer: keeping productive, identifiable breeding populations through changing markets. Images can teach comb, plumage and body differences, while original articles explain the functions and selection behind them. The species library provides shared biology; the breed library preserves the distinct historical and genetic story.

Conservation & the futureFoundations & evidence
This breed’s documented story

Conservation & challenges

Early imported breeding groups were limited and additional shipments sometimes yielded only surviving males. This illustrates the effect of transport and small founder pools on breed development. Today, feather management and sound reproduction matter alongside tail length; similar long-tailed populations need accurate identification.

Care & daily lifeFoundations & evidence
General species foundations

Care foundations

Outdoor foraging offers insects and other foods but does not remove the need for balanced nutrition. Feed should suit the bird's stage and role, including growing birds and laying hens. Housing is also a health system: wet litter and accumulated ammonia can damage feet, skin and eyes. Ventilation, dry bedding, clean drinking water and protection from predators and disease introduction belong beside breed history. A heritage chicken's hardiness does not make it immune to management-related illness.

These are general species foundations. The breed's own history and traits help explain how it developed, while an individual animal's age, environment and purpose shape its daily needs. Preservation includes keeping animals healthy enough to express normal behavior and maintain future generations. Compare dependable husbandry guidance with breed registry descriptions, and distinguish inherited traits from assumptions about toughness. Teaching the reasons behind care decisions gives readers a stronger foundation than applying one feeding formula to every animal.

Science · identity · inheritance

A shared species. A distinct population.

Domestic chickens are associated with Gallus gallus. The scientific species name and the many domestic breed names operate at different levels; a chicken breed is not a separate species.
KingdomAnimalia
PhylumChordata
ClassAves
OrderGalliformes
FamilyPhasianidae
GenusGallus
Scientific treatmentGallus gallus (Linnaeus, 1758)
Domestic populationYokohama

Breed identity is separate from species-level assessment. Gallus gallus (Linnaeus, 1758) · GBIF ↗

Breed identity · documented sources

Evidence that belongs to this animal.

The Livestock Conservancy lists Yokohama as Threatened. This domestic-population category is distinct from an IUCN assessment of a wild species.

Conservancy breed account ↗ · Assessment framework ↗. These references support the teaching in this world and offer independent perspectives.

Why this is its own conservation world

Identity, usefulness and inherited history belong together.

This world connects yokohama with its documented development, characteristics and conservation context.

Our evidence standard: source-reported facts, original interpretation and unresolved evidence remain distinguishable.

Care · daily life · practical stewardship

Understand what it takes to raise the animal.

Species foundations belong beside the breed’s documented traits and the individual’s condition.
Life cycle · species foundations within this breed world

From an egg to a living flock.

Follow the animal from its beginning through the changes in feeding, shelter, behavior and care. Select a stage to look closer.

21 daysIncubation · approximate species reference

Healthy adults can contribute to the next generation; care and documented ancestry connect the cycle.

Chicks emerging from eggs; USDA photograph. Breed and sex are not identified.
General species exampleChicks emerging from eggs; USDA photograph. Breed and sex are not identified.USDA · Public domain ↗Reuse terms ↗Date not stated
Stage 2 · what changes

Hatching & first days

A chick needs warmth, water and suitable starter feed. Prepare its setting before arrival and observe its behavior.

What to observe

Watch access to warmth, water and starter feed, the way young birds gather or spread out, and whether each bird can reach the essentials.

Raised with a broody hen

A maternal hen supplies warmth and guides chicks. The keeper still provides a protected setting, feed, water and checks that each chick thrives.

Managed brooder rearing

Provide a warm area, cooler retreat, dry bedding and suitable feeders and drinkers. Watch chick behavior as well as the thermometer. Brooding normally supports birds eating for themselves; it is not routine syringe feeding.

Life-stage teaching sources

Conservation Legacy original teaching. Image captions identify the pictured animal; general species examples remain separate from selected-breed images.

Growth & development · evidence in view

See when life changes.

Body growth, reproductive development and managed weaning describe different changes. Explore the reference windows beside the care they help explain.

Before birth or hatch

Incubation

21 days

Approximate species reference for planning.

Evidence ↗

After birth or hatch · reference windows

General chickens; seven named breeds in Missouri pasture trial separate below. Bars share a time axis measured from birth or hatch; each label retains its source units.

First laying under adequate management/light18–22 weeks
species reference

Timing depends on breed; not a Buckeye/Jersey Giant measured mean.

Source for this window ↗
Birth / hatch · 0154 days
Husbandry sources
Read the complete species care guide →

What we risk losing

Keep a living inheritance within reach.

Threatened · The Livestock Conservancy, 2026. Preservation includes the living animals, their families and the people able to keep them. The sequence beside this text explains a process; it is not a measured decline for this breed.Explore this breed’s conservation →
  1. Historic family

    Recorded families connect today’s animals with the people and places that shaped them.

  2. Funneling begins

    Some branches stop reproducing, or their records become difficult to follow.

  3. Bottleneck

    Representation can concentrate into fewer animals and fewer distinct breeding options.

  4. Preservation window

    Age, health, living animals, reliable records and available homes influence what can continue.

  5. Action or loss

    Education, care, documentation and coordinated stewardship shape what survives.

Population · dates · scope

Numbers need their context.

A status, registration count and breeding-population estimate answer different questions. Their dates and definitions matter.

Conservation status and source-reported population evidence

A directly verified population measure has not yet been established for this page. Its conservation category remains useful, but does not supply a current head count.

The community carries it forward

The future needs people who keep its knowledge alive.

A dated photograph, a keeper’s experience, a historical source or a documented correction can help the next generation understand yokohama.
What you know today can become part of what this breed still has tomorrow.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.Breed knowledgeKeep traits connected to the documented population.Teach what sources establish and identify what still needs evidence.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.Stories & historyPreserve the people and places behind the animal.Dates, locations and source context make a memory more useful.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.Documents & photographsKeep the creator and meaning with the record.Share material with permission, accurate captions and provenance.
Yokohama chickens at the scientific poultry center in Sinsteden, Germany.Practical stewardshipConnect learning with responsible care.Use the species foundations and individual needs to guide further questions.

Keep exploring

One world. Many ways to enter.