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Bird Identifier

Identify birds by features

Identify bird species by selecting physical features like size, color, beak shape, habitat, and behavior. Narrow down possibilities from thousands of species to find your bird.

50 cm)'}[this.size] || ''; }, get filtered() { return this.birds.filter(b => { if (this.size === 'small' && (b.length_cm === null || b.length_cm >= 20)) return false; if (this.size === 'medium' && (b.length_cm === null || b.length_cm < 20 || b.length_cm > 50)) return false; if (this.size === 'large' && (b.length_cm === null || b.length_cm <= 50)) return false; if (this.habitat && b.habitats.length > 0) { const h = this.habitat.toLowerCase(); if (!b.habitats.some(x => x.toLowerCase().includes(h))) return false; } return true; }); }, reset() { this.step = 1; this.size = ''; this.color = ''; this.habitat = ''; } }">

鳥を識別する

ステップ1：鳥のサイズを選択

ステップ2：主要な色を選択

ステップ3：生息地を選択

フィルター：

件の鳥が見つかりました

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について Bird Identifier

Identify bird species by selecting physical features like size, color, beak shape, habitat, and behavior. Narrow down possibilities from thousands of species to find your bird.

Identification 無料ツール インタラクティブ

注目の鳥

アオボウシインコ

Amazona aestiva

アカオノスリ

Buteo jamaicensis

イヌワシ

Aquila chrysaetos

オウギワシ

Harpia harpyja

オカメインコ

Nymphicus hollandicus

オジロワシ

Haliaeetus albicilla

コンゴウインコ

Ara macao

シロエリハゲワシ

Gyps fulvus

セキセイインコ

Melopsittacus undulatus

ハクトウワシ

Haliaeetus leucocephalus

ヘビクイワシ

Sagittarius serpentarius

Downy Woodpecker

Picoides pubescens

Anna's Hummingbird

Calypte anna

Wilson's Bird-of-paradise

Cicinnurus respublica

Northern Gannet

Morus bassanus

Laughing Kookaburra

Dacelo novaeguineae

Eurasian Eagle-Owl

Bubo bubo

Common Ostrich

Struthio camelus

Great Cormorant

Phalacrocorax carbo

Common Kingfisher

Alcedo atthis
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How to Use

  1. 1
    Select size and body shape

    Begin by estimating the bird's overall size relative to familiar species like a sparrow, robin, or crow. Note the body proportions including tail length, wing shape, and whether the bird appears stocky or slender.

  2. 2
    Choose plumage and beak features

    Select the dominant colors and patterns you observe, including any distinctive markings like eye rings, wing bars, or breast streaking. Beak shape is a critical diagnostic feature—hooked beaks indicate raptors, while slender curved beaks suggest nectar feeders.

  3. 3
    Specify habitat and behavior

    Indicate the habitat type where you observed the bird and note any behavioral clues such as foraging style, flight pattern, or vocalizations. Many species are strongly associated with particular ecosystems, dramatically narrowing identification possibilities.

About

Bird identification is the foundation of ornithology and citizen science, enabling observers to document species distributions, detect population changes, and contribute to conservation planning. The discipline draws on a rich toolkit of diagnostic features—morphology, plumage, behavior, habitat association, and vocalizations—that collectively allow experienced observers to identify most species under field conditions.

Plumage patterns result from structural coloration (iridescence produced by feather microstructure) and pigment-based coloration (melanins, carotenoids, porphyrins). Sexual dichromatism, where males and females differ in appearance, evolved primarily through sexual selection and provides important clues to sex and age class. Seasonal molts complicate identification further, as many species present dramatically different breeding and non-breeding plumages. Understanding molt sequences—which feathers are replaced when—is essential for ageing birds accurately.

Modern bird identification integrates traditional field guide skills with digital tools including photographic databases, acoustic recognition software, and community science platforms that aggregate millions of sightings annually. The eBird database maintained by the Cornell Lab of Ornithology now holds over 1 billion bird occurrence records contributed by millions of observers worldwide, transforming our understanding of migration phenology, range shifts under climate change, and species abundance patterns at continental scales.

FAQ

Why is beak shape such an important identification feature?
Beak morphology reflects a species’ primary feeding strategy and evolutionary history, making it one of the most reliable identification features. Darwin’s finches famously illustrated how beak shape diverges with food sources—thick conical beaks crush seeds, hooked raptorial beaks tear flesh, and long decurved beaks probe flowers or mud. Because beak shape is under strong natural selection, closely related species occupying different ecological niches often differ more in bill morphology than in plumage. Field guides typically illustrate bill shapes as one of the first features to examine when narrowing down an identification.
How do I distinguish similar-looking species like house sparrow and song sparrow?
Separating similar species requires attending to multiple subtle features simultaneously rather than relying on a single mark. Song sparrows show prominent breast streaking that converges into a central spot, a long rounded tail, and a distinctive pumping flight pattern not seen in house sparrows. House sparrows display a chestnut nape (males), a shorter thicker bill suited to seed-cracking, and tend to flock in urban environments. Range and habitat context provide additional clues—song sparrows favor shrubby wetland edges while house sparrows are almost exclusively associated with human settlements globally. Voice is often decisive when visual features are insufficient.
Can I identify birds by their songs and calls alone?
Acoustic identification is entirely valid and increasingly recognized as primary evidence in bird surveys, particularly for cryptic or secretive species. Each species produces species-specific vocalizations shaped by sexual selection and territorial signaling, and experienced observers can identify the majority of birds in a region by ear. Dawn chorus identification requires learning the characteristic qualities of each song—its pitch, rhythm, complexity, and phrasing. Bioacoustics software and apps now apply machine learning to spectrograms to automate species identification, achieving accuracy comparable to expert observers for many common species. Calls differ from songs and include flight calls, alarm notes, and contact calls that are often more useful for nocturnal migrants.
What is the difference between birds that look alike but are different species?
Species that appear visually similar are said to form a ‘sibling species complex’ or cryptic species group, where morphological convergence masks genetic and ecological distinctiveness. This phenomenon is common in groups like Empidonax flycatchers, where species are nearly identical visually but entirely distinct vocally and genetically. Cryptic species often occupy slightly different ecological niches, use different habitats for nesting, or breed at different times, reducing direct competition through character displacement. Genetic analysis has revealed many previously unrecognized cryptic species, increasing documented avian diversity. The phenomenon underscores why ornithologists integrate morphology, vocalizations, behavior, and genetics for definitive species delimitation.
How many bird species are there and how are new ones discovered?
Approximately 10,000–11,000 bird species are currently recognized, though this number continues to change as taxonomic revisions split or lump species based on new evidence. New species are still being described at a rate of roughly 5–15 per year, primarily from remote tropical regions like the Andes, New Guinea, and island archipelagos. Discovery methods include morphological examination of museum specimens thought to represent single species, genetic analysis revealing cryptic lineages, and field expeditions to under-surveyed habitats. Taxonomic committees such as the IOC World Bird List and the American Ornithological Society publish annual updates that incorporate new species, splits, and lumps based on peer-reviewed evidence.