Western bluebird (Photo by Tim Zurowski)
Western bluebird (coastal population)
Known as the harbinger of spring, the western bluebird’s subtle song can be heard as the weather warms and wildflowers start blooming in western Canada.
What does it look like?
A member of the thrush family, the western bluebird has a bright blue head and wings, with a rust-orange front that often extends onto its back. Males are larger and brighter than the greyish-brown females.
Where is it found?
The western bluebird ranges from BC and Alberta, through the western U.S. into southcentral Mexico. Six sub-species have been identified, two of which occur in Canada. The coastal population occurs in the Salish Sea region of southwestern BC and western Washington. In early fall, these short-distance migrators fly to wintering grounds in Oregon, California and Mexico. They return in late February and March and are among the first migratory birds to re-appear each spring.
The coastal population of western bluebird occurs in open woodlands, such as Garry oak savannahs. Today, less than five per cent of these habitats remain in Canada, making this one of Canada’s most endangered ecosystems.
These songbirds are cavity nesters, meaning they find nesting sites in the holes of living or dead trees. Because they can’t create their own holes, they depend on naturally occurring cavities, old woodpecker nests or bird houses.
What does it eat?
These petite predators perch on low branches, fences and shrubs. Here, they scan the ground for insects to eat, and then drop to the ground when they have spotted one. These birds prefer large, open areas with low grasses so they can easily see ground-dwelling insects.
What is NCC doing to protect habitat for this species?
Bringing back the bluebirds
Western bluebirds were once common on Vancouver Island and the Gulf Islands, but they had all but disappeared from the region by 1995. Their decline was probably due to a combination of Garry oak habitat loss, the removal of dead standing trees that provide nesting cavities and the competition for nest holes with introduced European starlings and house sparrows.
Inspired by the success of a western bluebird reintroduction project in the nearby San Juan Islands in Washington State, the Garry Oak Ecosystems Recovery Team (GOERT) established the Bring Back the Bluebirds Project in 2011.
The goal was to re-establish a breeding western bluebird population on southeastern Vancouver Island and the southern Gulf Islands by installing nest boxes in suitable habitat and through translocation (i.e., capturing, transporting and releasing birds from one area to another).
In 2012, the Nature Conservancy of Canada (NCC) joined GOERT, the Cowichan Valley Naturalists Society (CVNS), Ecostudies Institute (Washington) and the Province of British Columbia in efforts to reintroduce western bluebirds to the Cowichan Valley. From 2012 through 2016, 56 adults and 64 nestlings were translocated from the closest healthy population in Washington State. NCC’s Cowichan Garry Oak Preserve in Duncan, BC, was the first release site.
Since 2017, CVNS has coordinated this conservation effort. Through community engagement and volunteers’ hard work, CVNS is ensuring that the network of over 200 nest boxes on nearly 70 private properties continues to provide nesting sites for western bluebirds and other native cavity nesters.
A precarious success
Translocations of this migratory species have been successful, with more adults returning each spring to Vancouver Island and the San Juan Islands and some birds moving between the two states. However, the small population remains vulnerable. More translocations may be required to secure this species’ long-term presence on Vancouver Island.
The Cowichan Garry Oak Preserve is one of the world’s last and best remnants of Garry oak ecosystems.
With bluebirds returning to the Cowichan Valley each spring, delighting visitors and staff alike, hopes are high that they are back for good.
This story first appeared in the summer 2019 issue of the Nature Conservancy of Canada Magazine. Donors who contribute at least $25 or more per year will receive four issues of the magazine. Click here to donate today and start receiving the magazine.