{# ════════════════════════════════════════════════════════════════════════ Side-by-side Comparison Table ════════════════════════════════════════════════════════════════════════ #}

Side-by-Side Comparison

Attribute	Guam Reed-warbler	Papyrus Yellow Warbler
Scientific Name	Acrocephalus luscinius	Calamonastides gracilirostris
Order	Passeriformes	Passeriformes
Family	Acrocephalidae	Acrocephalidae
Conservation Status	Extinct	Vulnerable
Length	—	—
Wingspan	—	11.8 cm (4.6 in)
Weight	31.475 g (1.11 oz)	10.36 g (0.37 oz)
Diet	--	--
Clutch Size	2-4	2-3
Population Trend	—	—

{# ════════════════════════════════════════════════════════════════════════ Visual Size Comparison ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ Habitat Comparison ════════════════════════════════════════════════════════════════════════ #}

Habitat Comparison

Shared Habitats

🌿 Wetland

Guam Reed-warbler only

🌲 Forest 🌾 Grassland

Papyrus Yellow Warbler only

None

{# ════════════════════════════════════════════════════════════════════════ Song & Call Comparison ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ Geographic Range & Migration ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ Conservation Status Comparison ════════════════════════════════════════════════════════════════════════ #}

Conservation Status

Extinct

Guam Reed-warbler

Vulnerable

Papyrus Yellow Warbler

{# ════════════════════════════════════════════════════════════════════════ Identification Tips — How to Tell Them Apart ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ About Each Bird (Descriptions) ════════════════════════════════════════════════════════════════════════ #}

About These Birds

Guam Reed-warbler

The Guam Reed-warbler (<em>Acrocephalus luscinius</em>) was a member of the family Acrocephalidae that has been classified as Extinct by the IUCN, representing one of the many endemic Pacific island birds lost following the introduction of the brown tree snake to Guam after World War II. Detailed plumage and behavioral descriptions of this species are limited in the available literature. When extant, it inhabited forest, grassland, and wetland environments across Guam in the western Pacific. Its geographic range was confined to …

Papyrus Yellow Warbler

{# ════════════════════════════════════════════════════════════════════════ Related Comparisons ════════════════════════════════════════════════════════════════════════ #} {# ════════════════════════════════════════════════════════════════════════ More Birds in Family ════════════════════════════════════════════════════════════════════════ #}

More Birds to Explore

More from Acrocephalidae

African Yellow Warbler Iduna natalensis Aguijan Reed-warbler Acrocephalus nijoi Aldabra Brush-warbler Nesillas aldabrana Anjouan Brush-warbler Nesillas longicaudata All Acrocephalidae birds →

Explore the Nature FYI Family

🧬 SpeciesFYI

Species & Taxonomy

🦕 DinoFYI

6,000+ Dinosaurs

🐟 FishFYI

Fish & Marine Life

🌿 PlantFYI

379,000+ Plants