Javan Owlet (Glaucidium castanopterum)

Javan Owlet

[order] STRIGIFORMES | [family] Strigidae | [latin] Glaucidium castanopterum | [authority] Horsfield, 1821 | [UK] Javan Owlet | [FR] Chevechette spadicee | [DE] Trillerkauz | [ES] Mochuelo de Ceilan, Mochuelo de Java | [NL] Bruinvleugeldwerguil


Genus Species subspecies Region Range
Glaucidium castanopterum OR Java


Members of the genus Glaucidium are very small and tiny owls. They have rounded heads without ear-tufts. Their eyes are yellow. In many species the talons are, in relation to their size, very powerful. The facial disc is not very distinct. Some species have a large dark patch with a pale border on each side of the nape of the neck, looking like false eyes. Many are partly diurnal and sing from exposed perches. These are mostly very tenacious in the hunt, and show little fear, even of approaching humans. Glaucidium is a worldwide genus, containing some 30 species. Most of the Asian species, and some of the African species show physical and behavioural differences that suggest they might be better placed in Athene, and DNA evidence suggests that there is only a distant relationship between the Old World Pygmy Owls and those of the New World.

Physical charateristics

The facial disk has no clear rim and is barred rufous and dark yellowish. White eyebrows, head brown with fine yellowish barring. Upperparts chestnut rufous, Wings and tail barred dark yellowish and brown. Flanks and belly streaked brown-rufous. Bill green like with yellow tip, feet greenish-yellow and iris yellow-brown.

Listen to the sound of Javan Owlet

[audio: Owlet.mp3]

Copyright remark: Most sounds derived from xeno-canto

wingspan min.: 0 cm wingspan max.: 0 cm
size min.: 22 cm size max.: 26 cm
incubation min.: 0 days incubation max.: 0 days
fledging min.: 0 days fledging max.: 0 days
broods: 0   eggs min.: 3  
      eggs max.: 5  


Oriental Region : Java


Primary and secondary forest up to 900m. Sometimes up to 2000m


Uses old Woodpecker holes or other tree cavities as nest. Clutch size 4 eggs.

Feeding habits

Mainly insects and small rodents. Also birds and reptiles. Nocturnal hunter, pounces on prey from perch.


This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Javan Owlet status Least Concern



Distribution map

Javan Owlet distribution range map

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