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

Cape Verde Swamp Warbler

Acrocephalus brevipennis

The Cape Verde Swamp Warbler is a medium-sized, drab passerine endemic to the Cape Verde archipelago, distinguished by its melodious song and reliance on dense, humid vegetation. It is a sedentary species that occupies specialized ecological niches within volcanic valleys.

What it sounds like

A rich, liquid song composed of melodious warbles and flute-like whistles, often described as a softer, more musical version of the Great Reed Warbler.

Reference call, compare with what you heard

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Rec. Nicolas Martinez · Cape VerdeCC BY-NC-SA Xeno-canto

Field notes

It is the only member of the genus Acrocephalus found naturally in the Cape Verde Islands.
The species was once feared extinct on several islands before being rediscovered on São Nicolau and Fogo in the late 20th century.
Unlike most of its continental relatives, this warbler is non-migratory and remains in its breeding territory year-round.
It has successfully adapted to human-altered landscapes, frequently nesting in invasive Lantana camara thickets and sugar cane plantations.
Population stability is heavily dependent on rainfall, as prolonged droughts severely limit the availability of its humid microhabitats.

Habitat

Lush, well-vegetated valleys containing reed beds, giant cane (Arundo donax), and fruit orchards.

Range

Endemic to the islands of Santiago, Fogo, and São Nicolau in Cape Verde.

Similar & commonly confused birds

Aguiguan Reed WarblerAcrocephalus nijoi 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 Caroline Reed WarblerAcrocephalus syrinx

Heard a Cape Verde Swamp Warbler?

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Identify a bird by its song