The greater sooty owl (''Tyto tenebricosa'') is a medium to large

owl Owls are birds from the order Strigiformes (), which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance, a large, broad head, binocular vision, binaural hearing, sharp talons, and feathers a ...

found in south-eastern

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

, Montane rainforests of

New Guinea New Guinea (; Hiri Motu Hiri Motu, also known as Police Motu, Pidgin Motu, or just Hiri, is a language of Papua New Guinea, which is spoken in surrounding areas of Port Moresby (Capital of Papua New Guinea). It is a simplified version of ...

and have been seen on

Flinders Island Flinders Island, the largest island in the Furneaux Group, is a island in the Bass Strait, northeast of the island of Tasmania. Flinders Island was the place where the last remnants of aboriginal Tasmanian population were exiled by the colon ...

in the

Bass Strait Bass Strait () is a strait separating the island state of Tasmania from the Australian mainland (more specifically the coast of Victoria, with the exception of the land border across Boundary Islet). The strait provides the most direct waterwa ...

. The

lesser sooty owl The lesser sooty owl (''Tyto multipunctata'') is an owl that lives in the wet tropics region of Australia. It is sometimes considered conspecific with the greater sooty owl, ''Tyto tenebricosa'', by some authors. The birds are then together commo ...

(''T. multipunctata''), is sometimes considered to be conspecific with this species, in which case they are then together referred to as sooty owls. It is substantially smaller and occurs in the wet tropics region of

North Queensland North Queensland or the Northern Region is the northern part of the Australian state of Queensland that lies just south of Far North Queensland. Queensland is a massive state, larger than many countries, and its tropical northern part has been ...

, Australia.

Description

Greater sooty owls have a finely white spotted head with scattered white spots on the wings. The females are lighter colored than the males. They appear to be the heaviest of the living species in the barn owl family, however the Tasmanian subspecies of the Australian masked owl is larger still. The females' length is and weighs . The smaller male has a length of and weighs . The wing length is 30–40 cm. The large dark eyes are set in a round large facial disk. The facial disk is dark gray-silver or sooty black (changing with age) and has a heavy black edge. The upper part of the owl is black to dark gray and the under part is lighter. The tail is short and the legs are feathered. The feet and talons are large. Their call is a piercing shriek which can last up to two seconds.

Habitat

Greater sooty owls are nocturnal and roost in large

tree hollow A tree hollow or tree hole is a semi-enclosed cavity which has naturally formed in the trunk or branch of a tree. They are found mainly in old trees, whether living or not. Hollows form in many species of trees, and are a prominent feature of nat ...

s, caves and in dense foliage during daylight hours. Rarely seen or heard, they can be found in areas with deep gullies in moist forests, where smooth-barked gum trees, tree ferns and wet forest under-storey are present. They may hunt in drier areas but usually roost and breed in the moister areas. Greater Sooty Owl (Tyto tenebricosa)

Diet

Mammals, ranging from large arboreal

marsupial Marsupials are any members of the mammalian infraclass Marsupialia. All extant marsupials are endemic to Australasia, Wallacea and the Americas. A distinctive characteristic common to most of these species is that the young are carried in a po ...

s such as the greater glider, through ringtail possums and sugar gliders, to bandicoots, rodents, and antechinus comprise the most common items in the greater sooty owl diet. They also occasionally take birds, bats, and insects. Their dietary habits have changed since colonisation, possibly due to the reduction of terrestrial animal species, and they take more arboreal animals.

Behaviour

Greater sooty owls are territorial and are thought to remain in the same area throughout their adult lives. Sooty owls have a distinctive range of calls including typical barn owl like rasps and screams, a distinctive "falling bomb" call and an insect like twitter used during close contact with other sooty owls.

Reproduction

The nest is in a large hollow tree or a cave. The female roosts in the nest for several weeks before she lays one or two dull white eggs. Usually nesting commences from January through June but could occur at almost any time of the year depending on location and climatic conditions. The incubation time is 42 days. The male brings food to the female who rarely leaves the nest. The young are born with dull grey down and can fly in three months. The young remain dependent on the parents for an extended period after fledging. Their lifespan is unknown. They are territorial and sedentary throughout the year.

Conservation status

International

Their status is not globally threatened.

Australia

Greater sooty owls are not listed as threatened on the Australian

Environment Protection and Biodiversity Conservation Act 1999 The ''Environment Protection and Biodiversity Conservation Act 1999'' (Cth) is an Act of the Parliament of Australia that provides a framework for protection of the Australian environment, including its biodiversity and its natural and cultu ...

. However, their conservation status varies from state to state within Australia. For example: * The sooty owl is listed as threatened on the Victorian

Flora and Fauna Guarantee Act (1988) The ''Flora and Fauna Guarantee Act 1988'', also known as the ''FFG Act'', is an act of the Victorian Government designed to protect species, genetic material and habitats, to prevent extinction and allow maximum genetic diversity within the Au ...

. Under this Act, an ''Action Statement'' for the recovery and future management of this species has been prepared.
Department of Sustainability and Environment, Victoria
' * On the 2007 advisory list of threatened vertebrate fauna in Victoria, the sooty owl is listed as vulnerable. * On the New South Wales Threatened Species Conservation Act (1995), the sooty owl is scheduled as vulnerable.

References

External links

The Owl PagesInternet Bird CollectionImage Greater Sooty Owls in a hollow treeHBW Species pageBirdlife species factsheet
{{Taxonbar, from=Q1268348

greater sooty owl The greater sooty owl (''Tyto tenebricosa'') is a medium to large owl found in south-eastern Australia, Montane rainforests of New Guinea and have been seen on Flinders Island in the Bass Strait. The lesser sooty owl (''T. multipunctata''), i ...

Birds of New Guinea Birds of New South Wales Birds of Queensland Birds of Victoria (Australia)