Vireo bellii


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Vireo bellii
Species Authority: Audubon, 1844
Common Name(s):
English Bell's Vireo

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Butcher, G., Rosenberg, K. & Wells, J.
Facilitator/Compiler(s): Benstead, P., Bird, J., Harding, M., Sharpe, C J
This species has undergone moderately rapid declines and hence is considered to be Near Threatened.

Geographic Range [top]

Range Description: Vireo bellii summers in central and south-western USA and northern Mexico. Its winter range extends from south Baja California along the west coast of Central America, through Mexico, El Salvador, Guatemala, Nicaragua and Honduras (Brown 1993). The species has shown a decline of 2.7% per year since 1966 (J. Wells and K. Rosenberg in litt. 2003).

El Salvador; Guatemala; Honduras; Mexico; Nicaragua; United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Rich et al. (2004).

Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It frequents dense, low, shrubby vegetation in its breeding range where it has been extensively studied (Brown 1993). However, very little is known about its density, ecology or habitat use in the winter grounds.

Systems: Terrestrial

Threats [top]

Major Threat(s): Habitat loss and modifications through agricultural spread, logging and housing developments have caused declines and continue to threaten the species. Secondarily, rates of brood parasitism by Brown-headed Cowbirds (Molothrus ater), have caused reductions in breeding populations in south-west USA (Brown 1993).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Trapping cowbirds can significantly reduce brood parasitism (Collins et al. 1991), and is a standard management tool in one California study area (Beezley and Rieger 1987).

Conservation Actions Proposed
Protect key habitats for the species and manage others in a beneficial way. Continue to monitor trends and ascertain whether it is still declining. Identify the key threats and develop appropriate actions to tackle them.

Citation: BirdLife International 2012. Vireo bellii. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 28 August 2015.
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