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Predators of young bluebirds in the nests can include snakes, cats, and raccoons. Bird species competing with bluebirds for nesting locations include the common starling, American crow, and house sparrow, which take over the nesting sites of bluebirds, killing young, smashing eggs, and probably killing adult bluebirds. [6] Male western bluebird
Eastern bluebirds measure 16–21 cm (6.3–8.3 in) long, span 25–32 cm (9.8–12.6 in) across the wings, and weigh 27–34 g (0.95–1.20 oz). [12] [11] Male bluebirds have a bright head, back, and wings. Their breast is a brownish red. [12] Females are lighter with gray on the head and back and some blue on their wings and tail.
Adult female in Livermore, California. The western bluebird is a small stocky bird with a length of 15 to 18 cm (5.9 to 7.1 in). The adult male is bright blue on top and on the throat with an orange breast and sides, a brownish patch on back, and a gray belly and undertail coverts.
An adult male is bright turquoise-blue above and somewhat lighter blue underneath but with a white lower belly. An adult female has duller blue wings and tail, grey breast, grey crown, throat and back. In fresh fall plumage, the female's throat and breast are brownish near the flank, contrasting with white tail underparts. [10]
The adult Asian fairy bluebird is about 24 to 27 centimetres (9.4 to 10.6 in). The male has glossy, iridescent blue upperparts, and black underparts and flight feathers. The female and first year male are entirely dull blue-green. The Asian fairy bluebird eats fruits, nectar and some insects. Its call is a liquid two note glue-it.
The plumage of the fairy-bluebirds is exceptional, with the upperparts being deep rich blue. The Asian fairy-bluebird is sexually dimorphic in its plumage, the male being much brighter than the female, but the Philippine fairy-bluebird exhibits much less difference and the female is almost as bright as the male. The deep colour is provided by ...
Exhibits sexual dimorphism in which male are midnight black and electric blue while the female is dark turquoise with dark wingtips. It was formerly conspecific with the Asian fairy-bluebird but split due to plummage differences with males have a lighter more electric blue versus the darker blue of the former. Females are duller and more ...
The male is polygamous and performs a breathtaking courtship display. But unlike most other birds of paradise species, he performs solitary on a preferably thin branch, while an attending female observes nearby. In the display, the male hangs from a branch upside down.