If you would like to subscribe to BNA, please visit the Cornell Lab of Ornithology E-Store or call us at 877-873-2626 (M-F, - ET). While the effect on other cavity nesters was impressive, there was only a weak effect of adding nesting boxes for this population of Eastern Bluebirds, perhaps because their initial density was low.
e Bird data provide detailed looks at the range of this species throughout the year: e Bird Year-round Range and Point Map for Eastern Bluebird. This study nevertheless emphasized the importance of evaluation of “things we say about Eastern Bluebird biology” with random, replicated, and controlled experiments.
In Colorado, Eastern Bluebirds have bred at approximately 2,440 m above sea level () and nearby pines.
Open forests, forest edges, pastures, orchards, and parklands.2012), and to tree fall gaps in eastern deciduous forests.Eastern Bluebirds expanded into the grasslands of the Great Plains during the early 1900s, probably in response to human-induced increases in trees on former grasslands (). Study of individual variation in migration, opportunistic movement, and residency are clearly needed, perhaps particularly for populations breeding and residing in Mexico and other Central American locations. Onset of spring migration is poorly defined in some portions of the range because of the difficulty of distinguishing residents from migrants. Les oiseaux nicheurs du Québec: Atlas des oiseaux nicheurs du Québec meridional. Oklahoma (absent from panhandle; widespread elsewhere; Carter and Duggan 2004), and central Texas ( Arizona (Corman 2005) south through the Sierra Madre Occidental, into the highlands of central and s. Tamaulipas and into the interior of Chiapas Mexico, w.-central Belize (Mountain Pine Ridge -- rare and local, may be extirpated; L. See also Systematics: subspecies for range based on subspecies. Anecdotal information suggests that migration versus year-round residency is a matter of degree, with a greater proportion of individuals from harsher winter climates migrating than from milder winter locations. Michigan; while recoveries in the Gulf states (Texas, Louisiana, Mississippi, Alabama) include migrants from w. Evidence suggests that some northern migrants pass over resident populations to winter farther south ().
