History
Archeological work has revealed that Xenicus lyalli was widespread on the main islands of New Zealand in earlier times. Its disappearance from there was probably due to predation by the kiore (Polynesian Rat, Rattus exulans), which may have been introduced by the Māori. The presence of a flightless bird on an island separated from the mainland by 3.2 km may seem puzzling, along with the presence of Hamilton's frog (which is killed by exposure to salt water). One possibility is that rafts of vegetable matter allowed them to cross, although the absence of kiore would then be surprising. Stephens Island, along with the other islands in the Marlborough Sounds, was joined to the mainland during the last ice age due to the lower sea level, so the native animals may have arrived then.
Read more about this topic: Stephens Island Wren
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