Assiolo barbuto

Identificazione

The bearded screech owl is the smallest of its genus in North America. It is 16 to 20 cm (6.3 to 7.9 in) long; males weigh about 63 g (2.2 oz) and females 72 g (2.5 oz). In addition to being heavier, females have somewhat longer wings and tails, and in both sexes the wings extend past the tail. The species has two color morphs. In general the predominant one is light gray-brown and the other dark reddish, but more females seem to be of the reddish morph. Intermediates are known. Adults of the gray-brown morph have upperparts of that color with a "collar" and heavy spotting of whitish gray. The facial disc is also gray-brown surrounded by blackish brown. The underparts are pale with darker markings that give an ocellated appearance and feathing extends almost to the toes. The reddish morph replaces the gray-brown with dark reddish brown and the spotting and ocellated appearance are less distinct. Both morphs have a yellow eye, a greenish bill, and unfeathered pink toes.

Tassonomia

The bearded screech owl was first described by Philip Sclater and Osbert Salvin in 1868. It shares genus Megascops with more than 20 other screech owls. It is monotypic. The specific epithet barbarus is derived from the type locality of Santa Bárbara, Vera Paz, Guatemala, and "bearded" is apparently a errant derivation of it (bearded would be barbatus).

Nome scientifico

Megascops barbarus

Autorità

(Sclater, PL & Salvin, 1868)

Ordine

Strigiformi

Famiglia

Strigidae

Genere

Megascops

Areale e habitat

The bearded screech owl is found from the highlands of central Chiapas, Mexico south and east into the highlands of central and western Guatemala. In elevation it mostly ranges between 1,800 and 2,000 m (5,900 and 6,600 ft) but occurs as low as 1,350 m (4,400 ft) and as high as 2,500 m (8,200 ft). It inhabits humid temperate montane forest of several types; examples include pine-oak, oak, and cloudforest.

Migrazione

Resident species

Comportamento

The bearded screech owl is resident throughout its range.<p>The bearded screech owl is entirely nocturnal. It feeds almost exclusively on arthropods, especially beetles, with crickets, moths, roaches, spiders, and scorpions also taken. It hunts in the understory or forest edge, waiting on a perch and pouncing on prey on the ground. It does not take the prey to a perch but eats it where captured. It does not appear to cast pellets.<p>The bearded screech owl is territorial. Its breeding season appears to span from March to June. The only nest ever found was in a natural tree cavity where a reddish female was brooding a gray chick.<p>The bearded screech owl's territorial song is "a quiet and low-pitched, cricket-like trill of 3-5 [seconds] in duration, rising and dropping at the end." Both sexes sing, the males more often, and the male's song has a lower pitch than the female's. They also give "a soft ventriloquial hu."

Conservazione

Tendenza della popolazione

declining