Beautiful Nuthatch is an Indian bird that bears a scientific name "Sitta Formosa" sometimes called Callisitta Formosa. It is a bird species in the family of Sittidae.

Structure of Beautiful Nuthatch
Beautiful Nuthatch is a large nuthatch, measuring 16.5 cm in length that is not sexually dimorphic. Its coloration and markings are dramatic, the upper parts being black and azure, streaked with white and pale blue on the head and lined with the same colours on the wing feathers. The under parts are orange, and the eyebrow and throat are ochre. An irregular, dark eye stripe highlights its eye. S. formosa`s ecology is not fully described, but it is known to feed on small insects and larvae found on the trunks and epiphyte-covered branches of trees in its range.

Breeding of Beautiful Nuthatch
The reproduction of Beautiful Nuthatch takes place from April to May; the nest is placed in the hole of an oak, rhododendron, or other large tree.

Nests of Beautiful Nuthatch
The nest of Beautiful Nuthatch is made of plant material and fur in which the bird typically lays four to six eggs.

Concentration of Beautiful Nuthatch
Beautiful nuthatch is found in most of the countries making up the mainland of Southeast Asia, it appears to be rare throughout its range, its population being highly localized where it is found. The bird nests predominantly in mountain forests at an altitudinal range from 950 m (3,120 ft) up to nearly 2,300 m (7,500 ft), with some seasonal height adjustment, down to around 300 m (980 ft) in winter. Its apparent localization within its range makes rigorous estimates of its population difficult, but its habitat is threatened by deforestation and the species appear to be in decline.

Description of Beautiful Nuthatch
Beautiful Nuthatch was first described in 1843 by British zoologist Edward Blyth, from a specimen he examined in Darjeeling, West Bengal. Its kinship with other members of the genus is unclear. The bright blue colour of its plumage invites a comparison to the blue nuthatch (S. azurea), or other blue-tinted nuthatch species such as the velvet-fronted nuthatch (S. frontalis), yellow-billed nuthatch (S. solangiae) and the sulphur-billed nuthatch (S. oenochlamys), but its distribution being focused in the eastern Himalayan Mountain Range, and the uniqueness of its plumage, argues against the assumption.

Sexes of Beautiful Nuthatch
There is no sexual dimorphism of Beautiful nuthatch. The juveniles are very similar to adults, but the streaks on the mantle are blue rather than white. The primary coverts of juveniles are also more closely lined with blue, and the under parts are paler overall, especially on the chest. Adults perform a complete moult after the breeding season, whereas juveniles only have a partial moult, in which they replace a variable number of rectrices.

Size of Beautiful Nuthatch
Beautiful Nuthatch is large as compared with other members of the Sitta genus, measuring 16.5 cm (6.5 in) in length. Beautiful Nuthatch measures about 98-109 mm (3.9-4.3 in) in males and 97-100 mm (3.8-3.9 in) in females. The tail is 48-60 mm (1.9-2.4 in) in males and 52-56 mm (2.0-2.2 in) in females. The beak measures between 20 mm (0.79 in) and 24.9 mm (0.98 in) and the tarsus is 19-22 mm (0.75-0.87 in) in length. The weight is not known.

Breeding Season of Beautiful Nuthatch
The reproduction in the species has not been well studied. In the northeast of India, the breeding season is from April to May.

Nests of Beautiful Nuthatch
The nest of Beautiful Nuthatch is placed off the ground, between two and eight meters high, and is often built in a hole of a (living or dead) oak or rhododendron tree, or sometimes in other large trees. Nests are constructed using leaves and bark, held together with hair, often that of bamboo rats. If the opening of the hole is too large, it is cemented with mud to reduce the entrance size. The bird usually lays four to six white eggs, speckled with red spots that measure 20.8 mm X 15.3 mm (0.82 in X 0.60 in).

Concentration of Beautiful Nuthatch
Beautiful Nuthatch lives in the eastern Himalayas, and has been reported in several scattered sites across Southeast Asia, in the northwest of Vietnam and in central Laos. Its range stretches west into the northeast of India, where it was reported seen near Darjeeling in West Bengal, but not since 1933. It is present in Bhutan, and in the Indian states of Sikkim (in the town of Rangpo), in Meghalaya (in the Khasi Hills), in Assam (in the Dima Hasao district), in the south of Arunachal Pradesh, and in Manipur and Nagaland.