Thick-billed Grasswren (Amytornis modestus ssp. modestus)
The nominate race of the Thick-billed Grasswren once inhabited the Northern Territory of central Australia.
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edited: 02.05.2021
Eastern Thick-billed Grasswren (Amytornis modestus ssp. inexpectatus)
The Eastern Thick-billed Grasswren was described in 1912, it inhabited dense vegetation in the Murray-Darling basin in the northwestern part of New South Wales.
The bird reached a length of about 16 cm.
The Eastern Thick-billed Grasswren was never found again since its description and is considered extinct.
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edited: 22.03.2018
Dirk Hartog Island Thick-billed Grasswren (Amytornis textilis ssp. carteri)
The Dirk Hartog Island Thick-billed Grasswren was endemic to Dirk Hartog island off Western Australia, where it inhabited dense Acacia bushland.
The birds disappeared due to predation by feral cats and were last recorded in 1916 [or 1918 according to which source].
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edited: 22.03.2018
Northern Thick-billed Grasswren (Amytornis textilis ssp. giganturus)
The Northern Thick-billed Grasswren was endemic to Western Australia, it was originally discovered near the town of Mount Magnet, it was also found near the town of Wiluna and around Lake Carnegie, where it inhabited the salt-tolerant vegetation.
The Northern Thick-billed Grasswren was not found since 1908 [or 1909 according to which source] and is now extinct.
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edited: 22.03.2018