The scrubtit (''Acanthornis magna'') is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

in the thornbill family

Acanthizidae Acanthizidae—sometimes called Australian warblers—are a family of passerine birds which includes gerygones, thornbills '' Acanthiza'', and scrubwrens '' Sericornis''. The family Acanthizidae consists of small to medium passerine birds, with ...

. It is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Tasmania Tasmania (; palawa kani: ''Lutruwita'') is an island States and territories of Australia, state of Australia. It is located to the south of the Mainland Australia, Australian mainland, and is separated from it by the Bass Strait. The sta ...

and King Island in

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

. Its natural

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

is the temperate

rainforest Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...

, ''

Nothofagus ''Nothofagus'', also known as the southern beeches, is a genus of 43 species of trees and shrubs native to the Southern Hemisphere, found across southern South America (Chile, Argentina) and east and southeast Australia, New Zealand, New Guin ...

'' beech forest and

eucalypt Eucalypt is any woody plant with Capsule (fruit), capsule fruiting bodies belonging to one of seven closely related genera (of the tribe Eucalypteae) found across Australia: ''Eucalyptus'', ''Corymbia'', ''Angophora'', ''Stockwellia'', ''Allosyn ...

woodland. It is a small species that resembles the ''

Sericornis ''Sericornis'' is a genus of small, mainly insectivorous birds, the scrubwrens in the family Acanthizidae. Despite the similarity in shape and habits, the true wrens (Troglodytidae) are a quite unrelated group of passerines. The genus previous ...

'' scrubwrens (with which it was once placed).

Taxonomy

The scrubtit belongs to the

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

genus ''Acanthornis''. A 2017 genetic study using both mitochondrial and nuclear DNA found the ancestor of the scrubtit diverged from that of the three whitefaces of the genus ''

Aphelocephala ''Aphelocephala'' is a genus of bird in the thornbill family Acanthizidae. The three species are collectively known as whitefaces. They are endemic to Australia, generally occurring in the arid centre of the continent. They are a striking looking ...

'' around 7 million years ago. The combined lineage had diverged from the thornbill lineage around 13 million years ago.

Description

The scrubtit is long and weighs around . The

plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...

consists of a white throat and belly, a brown back, crown, flank and tail, black wings and grey on the face. The eye is pale and the bill is short, black and slightly curved. The species is often silent, but makes quite loud contact calls and has a song described as "sweet ndmusical".

Behaviour

The scrubtit forages individually, in pairs or in small family groups near the ground in dense cover. It feeds on small invertebrates, particularly insects and their eggs. The species will associate with

mixed-species feeding flock A mixed-species feeding flock, also termed a mixed-species foraging flock, mixed hunting party or informally bird wave, is a flock of usually insectivorous birds of different species that join each other and move together while foraging. These ar ...

s. The species is territorial and

monogamous Monogamy ( ) is a relationship of two individuals in which they form a mutual and exclusive intimate partnership. Having only one partner at any one time, whether for life or serial monogamy, contrasts with various forms of non-monogamy (e.g. ...

, with the breeding season lasting from September to January. The nest is a woven globe with a side entrance, lined with feathers and fur, camouflaged and usually found between 1–3 m off the ground. The

clutch size A clutch of eggs is the group of eggs produced by birds, amphibians, or reptiles, often at a single time, particularly those laid in a nest. In birds, destruction of a clutch by predators (or removal by humans, for example the California condor b ...

is usually three eggs but sometimes four. The eggs measure and are pearly white, with fine reddish spots, mostly around the larger end. No information exists about incubation or nestling times. Both parents feed the chicks in the nest, but unlike many Australian passerines helpers have never been reported. The species is victim to

brood parasitism Brood parasitism is a subclass of parasitism and phenomenon and behavioural pattern of animals that rely on others to raise their young. The strategy appears among birds, insects and fish. The brood parasite manipulates a host, either of the ...

fan-tailed cuckoo The fan-tailed cuckoo (''Cacomantis flabelliformis'') is a species of cuckoo in the family Cuculidae. It is found in Australia, Fiji, New Caledonia, New Zealand, New Guinea, Solomon Islands, and Vanuatu. Taxonomy Six subspecies have been recogni ...

s (''Cacomantis flabelliformis'') and

shining bronze-cuckoo The shining bronze cuckoo (''Chalcites lucidus'') is a species of cuckoo in the family Cuculidae, found in Australia, Indonesia, New Caledonia, New Zealand, Papua New Guinea, Solomon Islands, and Vanuatu. It was formerly placed in the genus ''Chr ...

s (''Chrysococcyx lucidus''), and

quoll Quolls (; genus ''Dasyurus'') are carnivorous marsupials native to Australia and New Guinea. They are primarily nocturnal, and spend most of the day in a den. Of the six species of quoll, four are found in Australia and two in New Guinea. Anot ...

s (''Dasyurus'') also take eggs and nestlings. The species is shy and unobtrusive and is seldom observed by people.

Conservation status

The species has a restricted range but is not considered

threatened A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensatio ...

by the

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

. The subspecies found on King Island (''A. m. greeniana'') is considered

critically endangered An IUCN Red List critically endangered (CR or sometimes CE) species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of t ...

, however. A 2018 study ranked this subspecies third as the Australian bird most likely to go extinct.PDF
/ref>

References

* Del Hoyo, J.; Elliot, A. & Christie D. (editors). (2006). Handbook of the Birds of the World. Volume 12: Picathartes to Tits and Chickadees. Lynx Edicions. {{Taxonbar, from=Q1586082 Acanthizidae Birds of Tasmania Birds described in 1855 Endemic birds of Tasmania Taxonomy articles created by Polbot