Photo: Andrea Shipley
Scientific Name: Sialia sialis
Classification: Nongame Species
Eastern bluebird pair (Photo: Wikimedia)
Eastern bluebird fledgling (Photo: Jodie Owen)
The male Eastern bluebird has bright blue upper parts, a rusty throat, breast and sides, and a white belly. The female’s coloring is similar, but duller. The bluebird’s average length is 7 inches. Eastern bluebirds prefer open or semi-open habitats with grassy areas and nearby woods. Farmyards, groves and even some residential areas provide suitable habitat. Bluebirds perch on trees, posts, power lines and fences to search for insects, dropping to the ground to capture their prey. Occasionally they catch an insect in the air. Bluebirds eat insects, snails, spiders and earthworms. They supplement their diet with berries, eating the fruits of plants such as viburnums, dogwoods, and black and pin cherry in the summer and fall. In the winter, they eat berries of sumac, pyracantha, mistletoe, bayberry and American holly. During winter, bluebirds roost in small flocks in woodlands or sometimes huddle in nesting cavities to keep warm. They must eat constantly during the day to survive cold nights.
The bluebird’s main predators are raccoons, cats, opossums and snakes. Members of the thrush family, bluebirds compete for nesting sites with other birds such as the house sparrow, the Carolina chickadee and the white-breasted nuthatch. During spring and summer, other birds raid bluebird nests for eggs and a place to raise their young. Bluebirds, too, may banish chickadees and other species from their nests.
Once a male finds a suitable site, he flutters and sings “churwee, chur-wee” to attract his mate for the season. Once she arrives, she must accept the site. If she does, both the male and female build a neat cup of dry grasses or pine needles. Nest building takes about 10 days.
After the young have hatched, the mother bluebird stays in the nest for the first few days to keep her young warm, and the male feeds them. Later, both parents feed the nestlings with soft insects, then coarser foods as they grow. The young grow quickly, leaving the nest 17 to 18 days after hatching. The parents care for the young and teach them how to catch their own food. The male takes over this job when the female begins her next nest. Bluebirds can raise two or three broods of young each year if not disturbed by predators. Young bluebirds from the first brood may stay and help with subsequent broods. Learn more about the Eastern Bluebird by reading the Eastern Bluebird Wildlife Profile.
The eastern bluebird is a nongame species with no open hunting season. Like other songbirds, bluebirds are federally protected under the Migratory Bird Treat Act. Because they are federally protected, it is illegal to harm them, their nests or their eggs.
There are no reported issues with this species. If you would like to help bluebird populations, you can erect a bluebird nest box on a pole with a baffle to keep out nest predators. This helps protect eggs and nestlings. Since mammalian nest predators can track human scent trails toa nest, when checking a bluebird box, it's always a good idea to go in a straigth path (leaving in the opposite direction than you arrived) rather than going up to the box and leaving the same way you came. That way your scent trail doesn't dead end at the nest.
N.C. Wildlife Resources Commission biologists survey bluebirds, along with other songbirds, through the Breeding Bird Survey (BBS), which is the largest standardized survey method for breeding birds in the world. Routes have been surveyed across the continent for decades. Each 25-mile route is surveyed at least once each breeding season. A point count (location where all birds are identified by sight or sound) is taken every 0.5 miles. Data are analyzed over the decades to help determine bird population levels and changes over time.
Eastern Bluebird Wildlife Profile (PDF)
Sandy Mush Game Land Birding Checklist (PDF)
Pond Mountain Game Land Birding Checklist (PDF)
Green River Game Land Birding Checklist (PDF)