The Sierra Madre ground warbler (Robsonius thompsoni) is a species of passerine bird in the family Locustellidae. It is endemic to the island of Luzon in the Philippines, where it is found in the northeastern and eastern foothills of the Sierra Madre. Its habitat is in tropical moist lowland and the lower reaches of tropical montane forest. Along with its closest relatives, the Cordillera ground warbler and the Bicol ground warbler, it is one of the most elusive birds in the country due to its extremely shy nature. While not officially threatened, its population is said to be declining due to habitat destruction through deforestation.
The Sierra Madre ground warbler feeds on insects and lives in tropical understories. It is a ground-walking songbird — rotund, with strong legs and weak wings — and it appears that it can barely fly. It tends to inhabit dense forest understories, where it feeds on insects. The bird looks similar to the other two species of ground warblers on the island of Luzon, the Bicol ground warbler and the Cordillera ground warbler, and probably for this reason it was not earlier recognized as a separate species.[2][3]
^BirdLife International (2016). "Robsonius thompsoni". IUCN Red List of Threatened Species. 2016: e.T103799569A104156423. doi:10.2305/IUCN.UK.2016-3.RLTS.T103799569A104156423.en. Retrieved 12 November 2021.
^"sierra madre ground warbler new bird". Retrieved 17 September 2013.
^"'Ventriloquist' bird discovered in Philippines". Kansas University. 3 September 2013. Retrieved 17 September 2013.
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