Animalia > Chordata > Aves > Passeriformes > Vireonidae > Vireo > Vireo cassinii

Vireo cassinii (Cassin's Vireo)

Synonyms: Vireo solitarius cassinii
Language: Spanish

Wikipedia Abstract

Cassin's vireo (Vireo cassinii) is a small North American songbird, ranging from southern British Columbia in Canada through the western coastal states of the United States. This bird migrates, spending the winter from southern Arizona (the Sonoran Desert) to southern Mexico. The vireo is 11–14 cm (4–6 inches) in length, with a gray head, back, and flanks, and whitish underparts. It has solid white "spectacles" and white wing bars. Cassin's vireo builds a cup nest out of bark strips and down in the fork of a twig. It lays 2 to 5 white eggs with some brown spots.
View Wikipedia Record: Vireo cassinii


EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 3.19158
EDGE Score: 1.43308


Adult Weight [1]  15 grams
Birth Weight [1]  2.1 grams
Breeding Habitat [2]  Temperate western forests
Wintering Geography [2]  Pacific Lowlands
Wintering Habitat [2]  Tropical dry forests, Mexican pine-oak forests
Diet [3]  Carnivore (Invertebrates), Granivore, Herbivore
Diet - Invertibrates [3]  70 %
Diet - Plants [3]  10 %
Diet - Seeds [3]  20 %
Clutch Size [5]  4
Global Population (2017 est.) [2]  4,300,000
Incubation [4]  14 days

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Kootenay National Park II 341762 British Columbia, Canada

Prey / Diet

Saissetia miranda (mexican black scale)[6]


Accipiter cooperii (Cooper's Hawk)[6]


Parasitized by 
Molothrus ater (Brown-headed Cowbird)[6]

Range Map

North America;



Attributes / relations provided by
1Terje Lislevand, Jordi Figuerola, and Tamás Székely. 2007. Avian body sizes in relation to fecundity, mating system, display behavior, and resource sharing. Ecology 88:1605
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
4del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
5Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
6Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
Images provided by Google Image Search
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access