How accurate is Birdsong's bird identifier?

It runs Google's Perch, a research-grade acoustic model covering nearly 15,000 species. When a call is ambiguous, we say so honestly and let you record a second clip to confirm, rather than guessing.

Is my recording stored?

No. Your audio is used to identify the bird in the moment and isn't saved to our servers. The birds you confirm are kept as cards in your own field journal; the recordings themselves are not.

Is the bird identifier free?

Yes — identify birds every day for free, no account required. Birdsong Pro ($3.99/mo or $39.99/yr) unlocks unlimited IDs, full field guides, your growing collection, and shareable Field Report cards.

Do I need an account or internet to identify a bird?

You'll need a connection to identify, since the AI runs in the cloud. No account is needed to try it — sign in with Google or email to save your field journal and sync it across devices.

Birdsong field guide

Aguiguan Reed Warbler

Acrocephalus nijoi

The Aguiguan Reed Warbler was a small, melodious passerine endemic to the Northern Mariana Islands before its extinction in the late 20th century.

What it sounds like

A loud, complex, and highly varied song featuring a series of rich whistles, warbles, and mimetic notes.

Reference call, compare with what you heard

No reference call found yet · Xeno-canto

Field notes

It was historically restricted to the tiny 7-square-kilometer island of Aguiguan, often referred to as 'Goat Island'.
Taxonomists frequently debate whether it represented a distinct species or a specialized subspecies of the Nightingale Reed Warbler.
The primary driver of its extinction was catastrophic habitat degradation caused by overgrazing feral goats and predation by introduced rats.
It possessed a notably long, slightly decurved bill optimized for gleaning insects and invertebrates from dense tropical foliage.
The species was last documented in the mid-20th century, with intensive surveys in the 1980s and 1990s failing to locate any survivors.

Habitat

Native limestone forests, secondary thickets, and dense vine tangles.

Range

Aguiguan Island, Northern Mariana Islands

Similar & commonly confused birds

Aquatic WarblerAcrocephalus paludicola Australian Reed WarblerAcrocephalus australis Basra Reed WarblerAcrocephalus griseldis Black-browed Reed WarblerAcrocephalus bistrigiceps Blunt-winged WarblerAcrocephalus concinens Blyth's Reed WarblerAcrocephalus dumetorum Cape Verde Swamp WarblerAcrocephalus brevipennis Caroline Reed WarblerAcrocephalus syrinx

Heard a Aguiguan Reed Warbler?

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