White-fronted Falconet

Identificazione

The white-fronted falconet is an extremely small shrike-like species of falcon, with a length of 14–17 cm (5.5–6.7 in), a mass of 35–65 g (1.2–2.3 oz), and a wingspan of 28–31 cm (11–12 in). It is similar to other falconets, but is the smallest by a small amount. Both sexes have glossy bluish-black upperparts, black flanks and outer thighs, and a black mask. The throat, cheeks, and breast are white, changing to pale yellowish-brown on the belly and vent. The tail is short and black, with the wings reaching halfway to its tip. Males have a white forecrown and forehead, while females have this region reddish-brown. Females are also 9 per cent larger in size and have 4 per cent longer tails. In both sexes, the eyes are brown and the cere and legs are dark grey to black. Juveniles are similar to females, but have tawny-buff forecrowns and cheeks, while young females may also show reddish-brown on the forecrown.<p>The species may be confused with the black-thighed falconet, with which its range overlaps, but can be told apart from the latter and all other falconets by the colour of its forehead. The black-thighed falconet also has more intense reddish-brown on the belly and vent, along with white bars on the underside of the tail, which is pure black in the white-fronted falconet.<p>The white-fronted falconet's vocalizations are not well-known, but are assumed to be similar to those of other falconets. It makes a quavering kree-kree-kree.

Tassonomia

The white-fronted falconet was first described as Microhierax latifrons by the British ornithologist Richard Bowdler Sharpe in 1879 on the basis of specimens from the Lawas River and Lumbidan in Borneo. The generic name Microhierax is from the Ancient Greek mikros, meaning small, and hierax, meaning hawk. The specific name latifrons is from the Latin latus, meaning wide or broad, and frons, meaning forehead. White-fronted falconet is the official common name designated by the International Ornithologists' Union.<p>The white-fronted falconet is one of five species in the falconet genus Microhierax, which is found in Southeast Asia, South Asia, and the Philippines. A 2004 study of mitochondrial and nuclear DNA by Carole Griffiths and colleagues found that within the family Falconidae, the falconets were mostly closely related to the pygmy falcons (Polihierax). These two genera are further sister to the falcons of the genus Falco. No subspecies of the white-fronted falconet are recognised.

Nome scientifico

Microhierax latifrons

Autorità

Sharpe, 1879

Ordine

Falconiformi

Famiglia

Falconidae

Genere

Microhierax

Areale e habitat

The white-fronted falconet is endemic to Borneo, where it is found in the Malaysian states of Sarawak and Sabah, along with the extreme northeastern part of Kalimantan (the Indonesian portion of Borneo). It inhabits open forests, forest edges, clearings with dead trees, and cultivated regions with interspersed trees, and is thought to be especially common on mountainous slopes. It is also infrequently found in mangrove forests. The species is found at elevations of 0–1,200 m (0–3,937 ft).

Migrazione

Specie stanziale

Comportamento

Comportamento migratorio: Specie stanziale.

Conservazione

Tendenza della popolazione: in diminuzione.

Tendenza della popolazione

in diminuzione