The extinct ibis remembered as the Réunion solitaire was the Réunion ibis, an island species that disappeared in the early 18th century.
Its scientific name is Threskiornis solitarius. The bird was endemic to Réunion in the Indian Ocean, then known as Bourbon. Travelers in the 17th and early 18th centuries described a largely white, solitary bird that flew poorly and was hunted for food.
For many years, naturalists mistakenly connected the solitaire with a supposed white dodo. That interpretation changed after ibis subfossils were discovered on Réunion in 1974 and scientifically described later. The remains, together with historical accounts, are now widely accepted as evidence for an extinct Réunion ibis.
Human hunting, introduced cats and rats, and pressure on its habitat likely drove the species to extinction. The last definite historical account dates to 1708; estimates commonly place its disappearance around 1710–1715.