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The striated grasswren (''Amytornis striatus'') is a small, cryptically coloured ground-dwelling species of wren-like bird in the Maluridae family, endemic to Australia. It occupies a large discontinuous range across arid and semi-arid areas of western, central and southern Australia where it is associated with spinifex (''Triodia'') grass. This species is currently recognised as having three subspecies, and is the subject of ongoing studies that may lead to it being split into four or more different species. == Description == The striated grasswren is one of 11 species in the genus ''Amytornis'', commonly known as the grasswrens,〔Christidis, L., F. E. Rheindt, W. E. Boles & J. A. Norman, 2013. A re-appraisal of species diversity within the Australian grasswrens ''Amytornis'' (Aves: Maluridae). Austral. Zoologist 36 (4).〕 found only in arid and semi-arid areas of Australia. All are small cryptic birds with long, usually cocked-tails, characterised by diagnostic distinctive interscapular gap in the feathering,〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕 an enlarged auditory bulla (tympanic chambers) and ten rectrices.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕 The striated grasswren is a slim, long-tailed grasswren with a slender pointed bill. The plumage is highly variable across its range, suited to local soil and rock colour; birds are slightly sexually dimorphic; females have a brighter rufous flank-patch.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕〔Pizzey, G. and Knight, F. 2012. The field guide to the birds of Australia, 9th edition. Sydney, N.S.W., Sydney, N.S.W. Harper Collins Publishers.〕〔Morcombe, M. 2011. Field Guide to Australian Birds. Steve Parish Publishing.〕 All populations are soft red-brown above, streaked white; an orange-buff eyebrow and fore-supercilium; white throat; bold black submostachial stripe; and buffish underbody.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕〔Pizzey, G. and Knight, F. 2012. The field guide to the birds of Australia, 9th edition. Sydney, N.S.W., Sydney, N.S.W. Harper Collins Publishers.〕〔Morcombe, M. 2011. Field Guide to Australian Birds. Steve Parish Publishing.〕 Like other grasswrens they have short rounded wings and are unable to undertake long flights, typically flitting or hopping from perch to perch within vegetation, and run or hop when on the ground in a series of fast jerky movements.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕〔Wood, K.A. 2014b. Observations of the Striated Grasswren Amytornis striatus rowleyi at Opalton, central western Queensland. Australian Field Ornithology 2014 31 17-23.〕 While closely related to the familiar fairy-wrens (''Malurinae'') striated grasswrens are larger (17-20g c.f. 6-16g), and more sombrely coloured, with varyingly prominent white streaking on varying shades of brown, rufous and black plumage.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕 Striated grasswrens are usually seen as pairs, but sometimes as individuals, and often in small groups of up to five birds,〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕〔Wood, K.A. 2014b. Observations of the Striated Grasswren Amytornis striatus rowleyi at Opalton, central western Queensland. Australian Field Ornithology 2014 31 17-23.〕 which are unobtrusive, shy, and typically difficult to approach, often first detected by their calls.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕〔Wood, K.A. 2014b. Observations of the Striated Grasswren Amytornis striatus rowleyi at Opalton, central western Queensland. Australian Field Ornithology 2014 31 17-23.〕 When breeding, birds may be inquisitive of intruders of their territory.〔Higgins, P. J.; Peter, J. M.; Steele, W. K. 2001. Handbook of Australian, New Zealand and Antarctic Birds: Tyrant-flycatchers to Chats. Oxford University Press, Oxford.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Striated grasswren」の詳細全文を読む スポンサード リンク
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