Passeriformes / Acrocephalidae / Arundinax
Thick-billed Warbler
Arundinax aedon · 厚嘴苇莺
Introduction
A passerine bird breeding in the temperate east Palearctic, from south Siberia to west Mongolia. It is migratory, wintering in tropical South Asia and South-east Asia, and is a very rare vagrant to western Europe. Found in dense vegetation such as reeds, bushes, and thick undergrowth.
Description
A large warbler, 16–17.5 cm (6.3–6.9 in) long. The adult has an unstreaked brown back and buff underparts, with few obvious distinctive plumage features. The forehead is rounded, and the bill is short and pointed. Sexes are identical, but young birds are richer buff below.
Distribution & Habitat
Breeds in the temperate east Palearctic, from south Siberia to west Mongolia. Migratory, wintering in tropical South Asia and South-east Asia. Very rare vagrant to western Europe.
Behavior & Ecology
Insectivorous, but will take other small prey items. Five or six eggs are laid in a nest in a low tree. The song is fast and loud, similar to the marsh warbler, with much mimicry and typically acrocephaline whistles added.
Source: Wikipedia · CC BY-SA 3.0
Taxonomy
- Order
- Passeriformes
- Family
- Acrocephalidae
- Genus
- Arundinax
Taxonomy Changes
Iduna aedon → Arundinax aedon
Genus transfer — GBIF Backbone Taxonomy uses the former name; AviList 2025 uses the current name.
Vocalizations
Subspecies (2)
-
Arundinax aedon aedon
breeds southern Siberia to western Mongolia; winters to Myanmar, Thailand, and Indonesia
Data Sources
Species description from Wikipedia, licensed under CC BY-SA 3.0.
Bird images and sounds sourced from GBIF, contributed by citizen scientists worldwide under Creative Commons licenses.
Taxonomy data from AviList 2025.
