Cassin's Vireo

Vireo cassinii

Order

PASSERIFORMES

Family

Vireos (Vireonidae)

Code 4

CAVI

Code 6

VIRCAS

ITIS

ILLUSTRATION

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PHOTOS

CONSERVATION STATUS

Least Concern

The Cassin's Vireo is native to the United States, Mexico, Guatemala and Canada. This terrestrial bird has a fairly large range of nearly 1.5 million square kilometers within its natural range. The population of Cassin's Vireo is more than 4 million individual birds. In 2000, Cassin's Vireo was rated as Lower Risk; however, this was downgraded to a Lest Concern rating due to its large population and lack of evidence that the population has decreased over the past generations.

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SUMMARY

Overview

Cassin's Vireo: Small vireo, olive-gray upperparts, white underparts, pale yellow flanks. Head is gray with white eye-ring that extends to brow. Wings are dark with two white bars. Until the 1990s was classified as the Solitary Vireo, along with the Blue-headed and Plumbeous Vireos.


Range and Habitat North America

Cassin's Vireo: Breeds from British Columbia and southwestern Alberta south to central Idaho and along the west coast to southern California. Most migrate to southern and central Mexico in the winter, but a small number spend it in southeastern Arizona. Prefers dry, open forests in mountains and foothills.


Range and Habitat Hawaii


Range and Habitat Palau

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INTERESTING FACTS

  • It is a fearless defender of its nest. Both the male and female will vigorously scold a predator and dive at it. The female often will not leave her nest and sometimes can be picked up off of it by a human observer.
  • The Cassin's Vireo was formerly lumped as a "Solitary Vireo," along with the Plumbeous and Blue-headed vireos, it is now considered a separate species.
  • Two subspecies are recognized. One is widespread in western North America from Canada to the northern part of Baja California. The other is found only on the very southern tip of Baja California more than 500 miles away.
  • A group of vireos are collectively known as a "call" of vireos.

SIMILAR BIRDS

RANGE MAP NORTH AMERICA

About this North America Map

This map shows how this species is distributed across North America.

FAMILY DESCRIPTION



SONGS AND CALLS

Xeno-Canto Sound

Cassin's Vireo A1

  • Title: Cassin's Vireo A1
  • Recordist: Andrew Spencer
  • Description: Song is a series of short rising and falling musical phrases.
  • Location: BC

Cassin's Vireo A2

  • Title: Cassin's Vireo A2
  • Recordist: Andrew Spencer
  • Description: Scold call is a rapid, chattering "chee-chee-chee".
  • Location: BC

Cassin's Vireo A3

  • Title: Cassin's Vireo A3
  • Recordist: Andrew Spencer
  • Description: Chatter calls with upward inflection at the end.
  • Location: BC

Similar Sounding Xeno-Canto

Plumbeous Vireo A2

  • Title: Plumbeous Vireo A2
  • Recordist: Andrew Spencer
  • Description: Typical song is a repeated "cheree, cheroo".
  • Location: TX
  • Date: "07/19/2016"

Similar Sounding Lang

Plumbeous Vireo 1

  • Title: Plumbeous Vireo 1
  • Recordist: Lang Elliott
  • Description: Song is a varied "chureeh, chi-reet".
  • Date: "April 28, 2014"
  • Location: UT

Voice Text

"chreuÂ… ch'reeÂ… choo'reet" or "chreeÂ… ch-ri'chi-roo"

Vocalization

Cassin's Vireo: Song is a mixed jumble of hesitant phrases, punctuated by short deliberate pauses, often repeated.

TERMINOLOGY

CREDITS

Author

Artist

Michael Oberhofer

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UnderpartsX

Belly, undertail coverts, chest, flanks, and foreneck.

UpperpartsX
Back, rump, hindneck, wings, and crown.
RiparianX
Relating to or living or located on the bank of a natural watercourse (as a river) or sometimes of a lake or a tidewater. 
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X