Mauritius Night-Heron

The Mauritius Night-Heron (Nycticorax mauritianus) is an extinct species of night-heron belonging to the family Ardeidae, formerly endemic to the island of Mauritius in the southwestern Indian Ocean. Unlike the Réunion Night-Heron which is known only from historical description, the Mauritius Night-Heron is known from subfossil and fossil skeletal remains recovered from Mauritian sites, allowing comparative analysis of its morphology. These remains indicate a large, robust heron, substantially larger than the extant Black-crowned Night-Heron (Nycticorax nycticorax) of the mainland, consistent with the pattern of island gigantism seen in other endemic Mascarene birds.

The skeletal evidence reveals that the Mauritius Night-Heron had proportionally shorter wing bones relative to its body size compared to continental night-herons, suggesting reduced flight capability — a common adaptation in birds on remote islands lacking terrestrial predators. This semi-flightless or poorly flying nature would have made the species highly vulnerable to predation by introduced mammals.

The species presumably inhabited wetland habitats on Mauritius, including coastal lagoons, streams, freshwater ponds, and the margins of forested rivers. It likely fed on fish, frogs, crustaceans, and other aquatic and semi-aquatic prey. The dietary ecology of the Mauritius Night-Heron can be inferred from comparison with surviving relatives, though direct evidence of its behavior and ecology is lacking.

The Mauritius Night-Heron became extinct following European settlement of Mauritius, which began in earnest in the mid-seventeenth century with the Dutch and continued with French and British colonization. The introduction of rats, pigs, cats, and monkeys, combined with direct hunting, deforestation, and wetland alteration, rapidly eliminated this endemic species. It is believed to have gone extinct by the early eighteenth century, if not earlier.

The species is listed as Extinct by the IUCN. Its disappearance forms part of the catastrophic loss of Mascarene endemic fauna during the colonial era, which also claimed the Dodo, the Rodrigues Solitaire, and numerous other birds unique to the islands.