The Open Bay Islands support several endemic species, including a terrestrial leech (
Hirudobdella antipodum), and a skink (
Oligosoma taumakae). In 2010 the skink was discovered on the Barn Islands, two rock stacks near Haast, as well as a terrestrial leech likely to be
Hirudobdella antipodum; the gecko, however, has only ever been recorded from Taumaki Island, and only 15 have been seen. Taumaki Island has been identified as an
Important Bird Area by
BirdLife International because it is a breeding site for
Fiordland penguins.
New Zealand fur seals currently numbering in the thousands have recolonized the islands following the end of commercial sealing.
Hector's dolphins and
bottlenose dolphins (occasional) are present at
Jackson Bay, and migratory
southern right and
humpback whales are also present.
Great white sharks have also been confirmed in the area.
Wekas Although introduced mammals are not known ever to have reached the Open Bay Islands, the introduction of
weka (a native flightless rail,
Gallirallus australis) from the South Island in the early 1900s has had an adverse impact on the flora and fauna of the islands. The
Department of Conservation have recommended to the Minister of Conservation that weka should be removed from the islands. The Trust which governs the island has agreed to removal on the condition that they are not killed. ==Castaways==