Tristram’s Storm Petrel, Oceanodroma tristrami

The Tristram’s Storm Petrel (Oceanodroma tristrami) is a species of seabird in the family of storm-petrels called Hydrobatidae. The species’ specific and common name comes from the English clergyman Henry Baker Tristram, the species can also be known as the Sooty Storm-petrel. The Tristram’s Storm Petrel is distribution across the North Pacific Ocean; mainly in tropical seas.

This storm-petrel has long angular wings and is 24 cm long. The plumage is dark all over with a slightly pale rump and a pale grey bar on the upper wing. It’s a colonial species, nesting in the Northwest Hawaiian Islands, and also in several small islands south of Japan, including the Bonin Islands and Izu. Colonies are attended nocturnally, and the species breeds during winter. At sea, the species is pelagic, feeding on fish and squid.

The Tristram’s Storm Petrel is measured as near-threatened. All of its breeding colonies within Hawaii are protected areas, but the species has undergone declines in the past because of introduced rats on Torishima Island.

Image Caption: Tristam’s Storm-petrel Oceanodroma tristrami at Tern Island, French Frigate Shoals. Credit: Duncan Wright/Wikipedia