Swain Reefs
Fauna
Birds
Nine small cays, with a combined area of 9 ha (22 acres), comprise the Swain Reefs Important Bird Area (IBA), identified as such by BirdLife International because together they support over 1% of the world population of breeding roseate terns, and even larger numbers of non-breeding roseate terns, with up to 25,000 individuals recorded there. Other birds recorded on the cays include masked and brown boobies, silver gulls, black-naped, sooty, bridled, greater crested, lesser crested and little terns, black and common noddies, and lesser frigatebirds. Cays supporting seabirds include Gannet Cay (1.7 ha (4.2 acres)), Bylund Cay (0.6 ha (1.5 acres)), Thomas Cay (1 ha (2.5 acres)), Bacchi Cay (0.5 ha (1.2 acres)), Frigate Cay (2 ha (4.9 acres)), Price Cay (1.6 ha (4.0 acres)), Distant Cay (0.25 ha (0.62 acres)), Riptide Cay (0.25 ha (0.62 acres)) and Bell Cay (1.5 ha (3.7 acres)).
Fish
The rockcod (Epinephelus fuscomarginatus), which is popular in Australian cuisine, occurs here at depths of about 220 m (720 ft).