Wallace's scops owl | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Strigiformes |
Family: | Strigidae |
Genus: | Otus |
Species: | O. silvicola |
Binomial name | |
Otus silvicola (Wallace, 1864) | |
Wallace's scops owl or lesser Sunda scops owl (Otus silvicola) is endemic to the Sumbawa and Flores islands, in the Lesser Sundas chain of Indonesia. It is not rare in most of its habitat and has no subspecies except for the nominate. It is also known as the Lesser Sunda scops owl. It is named after Alfred Russel Wallace, a British naturalist, explorer, geographer, and biologist. [3]
This strictly nocturnal owl has a mostly brown plumage, long ear tufts, bright yellow eyes, and strong underparts streaking. The adult can average 23 to 27 cm (9 to 101/2 inches) in length and weigh about 210g (71/2 ounces). [4] It can be recognized through its vocalization, which resembles the swishing sound of a sword. [4]
According to the International Union for Conservation of Nature and Natural Resources (IUCN), this species has been listed as "Least Concern" since its latest assessment in 2016. [5] That assessment has shown that the species' population trend is stable.
Little is known about this bird and more research is needed to better understand its behaviour, reproduction, and diet patterns.
The adult Wallace scops owl has a body length of 23 to 27 cm (9 to 101/2 inches), a wingspan between 202 and 251 cm (791/2 and 99 inches), and can weigh around 210 g (71/2 ounces). [4]
This small bird has a characteristic owl-shaped face with long ear tufts and bright yellow eyes. [4] It has brown plumage, a light-coloured face, grayish bill and cere, black ‘herringbone’ on brown to reddish vermiculations, pale breast and flanks lined with defined dark shaft streaks, and dark wavy cross-bars. [6] Its breast is slightly darker than the sides of the bird's belly which center is white. [7] The upper parts of the plumage are a paler gray-brown colour. [4]
Its flight feathers are a buff colour crossed by dark brown bars while its tail is brown with buff-colored bars. [6] The owls’ tarsi and some of its toes phalanges are feathered. [6] Compared with the adult, the juvenile bird is generally paler and its plumage is more fluffy. [6]
In the middle of the 1800s, the owls were separated into two distinct taxonomic groups: the Strigidae and the Tytonidae. [8] The Wallace's Scops owl is part of the Strigidae family, which is also called the "true owl" or "typical owl" family. These birds are known for their iconic owl looks with their large eyes, facial discs, nocturnal lifestyle, and soundless flight. [8]
There is a sympatric relationship between the Walace's scops owl (Otus silvicola) and the Flores scops owl (Otus alfredi), which is also present in the Lesser Sundas but is much smaller than the Wallace's scops owl. [9]
Only found on the Flores and Sumbawa islands of Indonesia, this bird has a large range of habitats. It has been found in forested areas, agricultural lands (plantations and secondary growth), houses’ backyards, and bamboo thickets. [4] It has been reported to perch itself at the very top of tall trees or in concealed positions, making it difficult to observe it. [10]
Wallace's scops owls have been reported to be common at ranges of 350–1,600 meters (0.2 to 1 mile). [11]
The Wallace's Scops Owl is known to be nocturnal. It is also presumed to be sedentary on the Flores and Sumbawa islands of the Lesser Sundas in Indonesia. [12]
Three main calls have been reported for this bird;
This owl species is thought to be mainly insectivorous, [4] but further studies are necessary to determine its diet with more precision.
Little to no information is known about this species' reproductive behaviour. It has been reported that the male presents enlarged testis in December. [6]
The Eurasian scops owl, also known as the European scops owl, common scops owl or just scops owl, is a small owl in the typical owl family Strigidae. Its breeding range extends from southern Europe eastwards to southern Siberia and the western Himalayas. It is migratory, wintering in Africa south of the Sahara.
The collared scops owl is an owl which is a resident breeder in south Asia from northern Pakistan, northern India, Nepal, Bangladesh, the Himalayas east to southern China, and Taiwan. It is partially migratory, with some birds wintering in India, Sri Lanka and Malaysia. This species was formerly considered to be included within what is now separated as the Indian scops owl.
Scops owls are typical owls in family Strigidae belonging to the genus Otus and are restricted to the Old World. Otus is the largest genus of owls with 59 species. Scops owls are colored in various brownish hues, sometimes with a lighter underside and/or face, which helps to camouflage them against the bark of trees. Some are polymorphic, occurring in a greyish- and a reddish-brown morph. They are small and agile, with both sexes being compact in size and shape. Female scops owls are usually larger than males.
The Japanese scops-owl is a small owl species in the family Strigidae, or true owl family. It is a member of the genus Otus, the scops owl genus. It is resident to Japan, China, Korea, and Russia.
The Philippine scops owl, also Luzon lowland scops owl is a common owl, endemic to the Philippines, belonging to the family of the typical owls Strigidae. Other common names include "Otus Whitehead", "Whitehead scops owl" and "Luzon lowland scops owl". Everett's scops owl and Negros scops owls were formerly considered conspecific but are now classified as separate species.
The Karthala scops owl, also known as the Grand Comore scops owl or Comoro scops owl, is a small scops owl endemic to the island of Grande Comore in the Comoro Islands.
The Andaman scops owl is a species of the Strigidae family and is native to the Andaman Islands of India. It is a largely brown owl with white speckles and yellow eyes. The owl was first described in 1873 by British Ornithologist Allan Octavian Hume. The Andaman Scops Owl has no sightings outside of the Andaman Islands, therefore research on this bird is limited. This owl is not threatened, though an increase in deforestation on the islands has led to the population size slowly declining. It is a nocturnal owl that feeds at night and has a nesting season from February to April.
The Flores scops owl is an owl endemic to the island of Flores, Indonesia. It is threatened by habitat loss. This owl is around 19–21 cm from head to tail. They are a forest dwelling owl that is smallish in size. Some 250–2,499 individuals are estimated to be extant in the wild, dwindling due to habitat loss.
The Rajah scops owl is a species of owl found on the islands of Borneo and Sumatra. The bird is named after James Brooke, Rajah of Sarawak. Based on patterns of speciation in other endemic montane bird species of the same region, it may potentially have to be split into two distinct species; if so, the name Otus brookii would be restricted to just the Bornean population.
The Javan scops owl is a small species of owl living mainly on western Java's high volcanos; local people refer to the owl as Celepuk Jawa. Like most owls, this nocturnal bird also has a strong ability of silent flight.
The Sunda scops owl is a small brown owl native to the Sunda Islands.
The Luzon scops owl or the Luzon highland scops owl is a species of scops owl endemic to Luzon, Philippines. Not to be confused with the Philippine scops owl, sometimes referred to as the Luzon lowland scops owl, which is a more common species that shares the same range. The Luzon scops owl, however, is smaller and inhabits higher altitudes than its lowland relative.
The Sangihe scops owl is an owl species endemic to the Sangihe Island of Indonesia.
The São Tomé scops owl is a species of owl in the true owl family, Strigidae. It is endemic to São Tomé Island, part of São Tomé and Príncipe, in the Gulf of Guinea, off the western equatorial coast of Central Africa.
The Mayotte scops owl is a species of owl in the family Strigidae. It is endemic to the island of Mayotte in the Comoros.
The Pemba scops owl is a species of owl in the family Strigidae. It is endemic to Pemba Island which is part of and off the coast of Tanzania.
The Madagascar scops owl, also known as the Malagasy scops owl or Rainforest scops owl, is a species of owl in the family Strigidae. It is found throughout Madagascar, now that it has recently been lumped with the Torotoroka scops owl, with which it was long considered a separate species from. The nominate O. r. rutilus is referred to as Rainforest scops owl.
The Lesser Sundas deciduous forests is a tropical dry forest ecoregion in Indonesia. The ecoregion includes the islands of Lombok, Sumbawa, Komodo, Flores, and Alor, along with the many adjacent smaller islands.
The Rinjani scops owl is a species of scops owl found only on Lombok in the Lesser Sunda Islands of Indonesia and its neighbouring Gili Islands. The only bird species endemic to the island, it was first recognized as a separate species in September 2003 and was formally described in 2013.