Cassin's Vireo

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Not yet spotted on Fladder

Cassin's Vireo is a medium-sized songbird of western North America, characterized by its grey head, olive-green back, and distinct white spectacles. It is a migratory species, known for its deliberate, rising and falling song.

Where to spot

Breeds in western North America, from British Columbia to California and parts of the Rocky Mountains. Winters in Mexico and Central America. It prefers coniferous and mixed-coniferous-deciduous forests.

How to spot

Look for its grey head and prominent white spectacles. Listen for its slow, deliberate, and often slurred song, which typically rises at the end of phrases, making it sound 'up-slurred.'

When to spot

Breeding season: spring and summer (April-July). Migration: spring (March-April) and fall (August-October). Winter: November-March. Most vocal during breeding season.

Where to spot

How to spot

Look for its grey head and prominent white spectacles. Listen for its slow, deliberate, and often slurred song, which typically rises at the end of phrases, making it sound 'up-slurred.'

When to spot

Breeding season: spring and summer (April-July). Migration: spring (March-April) and fall (August-October). Winter: November-March. Most vocal during breeding season.

Credits: Wikimedia Commons

Cassin's Vireo, like several other vireos, was once considered a subspecies of the 'Solitary Vireo,' but genetic and vocal studies led to its recognition as a distinct species.

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