Eastern Bluebird

Description:

This small, brightly colored thrush typically perches on wires and fence posts overlooking open fields. The birds forage by fluttering to the ground to grab an insect, or occasionally by catching an insect in midair. Bluebirds can sight their tiny prey items from 60 feet or more away. They fly fairly low to the ground, and with a fast but irregular pattern to their wingbeats. Males vying over territories chase each other at high speed, sometimes grappling with their feet, pulling at feathers with their beaks, and hitting with their wings. The boxes and tree cavities where bluebirds nest are a hot commodity among birds that require holes for nesting, and male bluebirds will attack other species they deem a threat, including House Sparrows, European Starlings, Tree Swallows, Great Crested Flycatchers, Carolina Chickadees, and Brown-headed Nuthatches, as well as non-cavity nesters such as robins, Blue Jays, mockingbirds, and cowbirds. Males attract females to the nest with a display in which he carries bits of nesting material into and out of the nest. Once a female enters the nest hole with him, the pair bond is typically established and often remains intact for several seasons (although studies suggest that around one in every four or five eggs involves a parent from outside the pair).

Habitat:

Eastern Bluebirds live in open country around trees, but with little understory and sparse ground cover. Original habitats probably included open, frequently burned pine savannas, beaver ponds, mature but open woods, and forest openings. Today, they’re most common along pastures, agricultural fields, suburban parks, backyards, and golf courses.

Notes:

Eastern Bluebird populations increased by almost 2 percent per year between 1966 and 2010, according to the North American Breeding Bird Survey. Partners in Flight estimates the global breeding population at 22 million, with 86 percent spending part of the year in the U.S., 22 percent in Mexico, and 1 percent breeding in Canada. They rate a 7 out of 20 on the Continental Concern Score and they are not on the 2012 Watch List. Eastern Bluebird populations fell in the early twentieth century as aggressive introduced species such as European Starlings and House Sparrows made available nest holes increasingly difficult for bluebirds to hold on to. In the 1960s and 1970s establishment of bluebird trails and other nest box campaigns alleviated much of this competition, especially after people began using nest boxes designed to keep out the larger European Starling. Eastern Bluebird numbers have been recovering since.