Endemic to the Falkland Island archipelago were it is only found on small offshore, predator-free islands.


Associated with tussac grass (Parodiochloa flabellata), a very tall and dense Falkland plant.

Optimum habitat is dense tussac-grassland growing from the high-water mark behind boulder beaches with accumulated dead kelp in which invertebrates thrive.

It also occurs in rushes and among rock outcrops up to 1 mile from coastal tussac.

Population biology

Surveys in 1998/1999 estimated the total population at 4,500 – 8,000 pairs.