the best bird sound player Singing the Female Bluebird - The Bluebird measures approximately 15 cm in length. The male has a completely dark blue plumage as an adult, with the forehead, eyebrows and upper coverings of the wings bright blue. The female and immatures are brown-brown.This bird is territorialist, so it is not possible to see them in flocks. If there is a couple in the right location, it will only be possible to find another couple at a certain distance. Baby bluebirds stay with their parents for up to a certain time, then move on to an "independent" life, as the bluebirds territorial instinct wont let him stay around after reaching adulthood.