The bluebirds are medium-sized, mostly insectivorous or omnivorous birds in the genus Sialia of the thrush family (Turdidae). Bluebirds are one of the few thrush genera in the Americas. They've blue, or blue and red, plumage. Female birds are less brightly colored than males, although color patterns are similar and there's no noticeable difference in size between sexes. Species: Eastern Bluebird, Sialia sialis Western Bluebird, Sialia mexicana Mountain Bluebird, Sialia currucoides Behavi… (More on Sialia)