The eastern bluebird is a member in the genus Sialia of the thrush family. It is one of the few thrush genera in the Americas. Bluebirds are about 6 to 8 inches long, have a wingspan of 9 to 12 inches long, and weigh around 1 ounce. It displays very vibrant colors. The male is blue on top, has a reddish-orange throat and breast, and a white underside. The female sports the same colors, but they are not as bright.
Bluebirds are territorial, and build nests in cavities to protect their young (in a behavior similar to woodpeckers). The female bluebird may lay 3 to 8 pale blue eggs at one time and then incubates them alone. During this time, the male bluebird takes responsibility for gathering food. The eggs hatch after 2 weeks, and the nestlings will open their eyes within 4 to 6 days. The chicks are ready to leave the nest within 18-20 days of hatching, but if this was an early brood one bird may stay back with its parents to help with the next brood. Bluebirds can produce between two and four broods during the spring and summer. Bluebird flocks migrate to the southeastern United States and Mexico during winter. These birds have a lifespan of 6 to 10 years in the wild.
Wild bluebird numbers had been in decline, due to the destruction of their habitat and competition with invasive species like house sparrows and starlings. However, in recent years bluebird sightings have been on the rise. This upswing is the result of a movement of volunteers establishing and maintaining bluebird trails.
Source : https://forum.americanexpedition.us/eastern-bluebird-facts
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