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#1239 · 🐦 birds

Western Olivaceous Warbler

🇳🇱 Westelijke Vale Spotvogel ·Iduna opaca

LCleast concern 🐦 Birds 📍 in Europe, not in NL
Western Olivaceous Warbler, photo 1 of 10
1/10 © Nik Borrow · CC BY-NC 4.0

what is it?

The western olivaceous warbler , also known as isabelline warbler , ( Iduna opaca ) is a "warbler", formerly placed in the Old World warblers when these were a paraphyletic wastebin taxon. It is now considered a member of the acrocephaline warblers, Acrocephalidae, in the tree warbler genus Iduna . It was formerly regarded as part of a wider "olivaceous warbler" species, but as a result of modern taxonomic developments, this species is now usually considered distinct from the eastern olivaceous...

base stats

  • NL sightings 0iNaturalist, research grade
  • worldwide 417iNaturalist observations
  • threat LCleast concern

Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).

fun facts

  • No confirmed wild sightings in the Netherlands on iNaturalist: you'd have to travel for this one.
  • 417 observations worldwide on iNaturalist.
  • Scientifically named by Jean Cabanis in 1850 (176 years ago).

fact sheet

English
Western Olivaceous Warbler
Nederlands
Westelijke Vale Spotvogel
scientific name
Iduna opaca
class
Aves
order
Passeriformes
family
Acrocephalidae
IUCN Red List
LC · least concern
sightings in NL
0
sightings in Europe
159
sightings worldwide
417
GBIF records in NL
0
weight
—
length
—
lifespan
—
named
1850 by Jean Cabanis

IUCN in Dutch: niet bedreigd. Blank means the sources don't say.

relatives· Acrocephalidae

Sources: iNaturalist taxon 201181, Wikidata Q10772716, GBIF 5739355, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.

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