Warbling Vireo
(Vireo gilvus)


Picture of bird
© Tony Battiste
For additional photos and vocalizations, visit Dendroica. (Link opens in a new window.)

The Warbling Vireo is an abundant bird in Canada's deciduous riparian forests, ranging from the Maritime Provinces to the west coast and north into the Yukon and the Northwest Territories. Breeding Bird Survey results demonstrate that the population in Canada has increased by some 47% since the early 1970s. The species is likely more common today than during historic times, having benefited from forest clearing during the 1800s and 1900s settlement period (James 2007a).


Main designations for the species
DesignationStatusDateSubspecies, population
IUCN (Global)Least concern2018 
Wild Species (Canada)Secure2015 

Population status

Geographic area or populationPopulation change relative to ~1970ReliabilityStatus in relation to goal
CanadaModerate IncreaseHighAt an Acceptable Level

Population estimate

Geographic area or populationPopulation estimate
Canada5,000,000 - 50,000,000 adults

Distribution maps


Migration strategy, occurrence

Long-distance migrant

Responsibility for conservation

Geographic areaResponsibility based on % of global population

General nesting period in Canada

Nesting period starts between mid-May and early June and ends in late July, depending on the region. Before or after this period, the probability of an active nest is lower.

Conservation and management

An abundant species with demonstrated population increases across the country, there are currently few conservation concerns in Canada for this species. In Ontario and Quebec, the Warbling Vireo may have benefited from clearing of coniferous forest, which created habitat by leaving large deciduous trees near open spaces (Gardali and Ballard 2000). However, the species may be vulnerable to loss of undisturbed deciduous forest habitat on the wintering grounds (Hutto 1989).


Bird conservation region strategies

Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:

  • conservation concerns (i.e., species vulnerable due to population size, distribution, population trend, abundance, or threats)
  • stewardship responsibilities (i.e., species that typify the regional avifauna or have a large proportion of their range or population in the sub-region)
  • management concerns (i.e., species that require ongoing management because of their socio-economic importance as game species, or because of their impacts on other species or habitats)
  • other concerns (i.e., species deemed a priority by regional experts for other reasons than those listed above or because they are listed as species at risk or concern at the provincial level)

Select any of the sub-regions below to view the BCR strategy for additional details.

BCRs, marine biogeographic units, and sub-regions in which the species is listed as a priority
RegionSub-region and priority type