The South Georgia Pipit is the only endemic passerine landbird on South Georgia. It is listed as "near threatened" by IUCN noting that it is vulnerable to predation by the Brown Norway Rat (Rattus norvegicus), introduced accidentally in the early 1800s by sealers and whalers. These pipits were nearly wiped out by these rats, but a few persisted on small peripheral rat-free islands. A heroic effort to eradicate brown rats on the main island has been successful and the pipits are already responding. Formerly difficult to see, we found them fairly easily along shoreline kelp wrack where we watched them forage on the endemic kelp fly (Paractora trichosterna). South Georgia was officially declared rodent free on 9 May 2018. Canon PowerShot SX50 HS
References:
BirdLife International. 2016. Anthus antarcticus. The IUCN Red List of Threatened Species 2016: e.T22718588A94587376. http://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22718588A94587376.en. Downloaded on 12 June 2018.
Tyler, S. (2018). South Georgia Pipit (Anthus antarcticus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/57794 on 12 June 2018).