The Bourbon Crested Starling (Fregilupus varius), also known as the Huppe, Crested Starling, or Réunion Starling, is a striking bird species that once inhabited the remote island of Réunion in the Indian Ocean. Sadly, this bird is now classified as extinct, having vanished from the wild by the mid-19th century. Its unique appearance and ecological role in Réunion’s forest habitats continue to fascinate ornithologists and bird enthusiasts alike. Through careful study of historical records and remaining specimens, scientists have pieced together the natural history of this enigmatic species, shedding light on its life and the unfortunate factors that led to its disappearance.
Scientific Classification
The Bourbon Crested Starling belongs to the family Sturnidae, which encompasses the diverse group of birds commonly known as starlings. Its scientific name is Fregilupus varius, a binomial coined by early naturalists who first described the species in the late 17th century. The genus Fregilupus is monotypic, meaning F. varius is the only species within this genus, highlighting the bird’s distinct evolutionary lineage within the starling family. This uniqueness is underlined by its unusual morphology, particularly its prominent crest and body coloration, which set it apart from other starlings found across the Indian Ocean islands and mainland Africa.
Phylogenetically, the Bourbon Crested Starling shows affinities with other island starlings but possesses characteristics that suggest an isolated evolutionary path. Its taxonomic placement has been revisited multiple times, with some early works mistakenly associating it with related genera due to limited specimen availability. Modern classification relies heavily on museum specimens and historical descriptions to affirm its status as a distinct species. Unfortunately, no living individuals remain for genetic analysis, and all knowledge depends on preserved remains and written accounts from explorers and naturalists.
Geographic Range & Distribution
The Bourbon Crested Starling was endemic to the island of Réunion, a French overseas territory situated in the Indian Ocean, approximately 700 kilometers east of Madagascar. Réunion’s volcanic landscape features a mix of mountainous terrain, dense forests, and coastal wetlands, providing a diverse array of habitats for its native flora and fauna. The Bourbon Crested Starling primarily inhabited the island’s swamp forests and mountainous coastal forests, regions rich in insect life and fruiting plants that supported its diet.
Historical records dating back to 1669 document observations of the starling across various parts of Réunion, with specimens collected from both lowland and upland forests. The species seemed to favor moist environments with dense vegetation, where it could forage effectively and nest securely. Despite its once localized range, there is no evidence that the starling ever colonized neighboring islands such as Mauritius or Rodrigues, which also had their own unique avifauna. The isolation of Réunion likely contributed to the bird’s specialized adaptations but also made it vulnerable to environmental and human-induced changes.
Physical Description
The Bourbon Crested Starling was a medium-sized bird, measuring approximately 30 centimeters (12 inches) in length from bill tip to tail. Its wingspan is estimated at around 29-32 centimeters, with wing feathers that were predominantly grey-brown, aiding in camouflage among the dense foliage. The tail measured about 11.4 centimeters (4.5 inches) and displayed a distinctive rufous or reddish-brown hue, contrasting with the otherwise muted wing coloration.
One of the most notable features of this starling was its distinctive crest, composed of elongated grey feathers that rose prominently from the crown of its head. This crest likely played a role in social signaling and mate attraction. The head, neck, and belly were predominantly white, providing a striking contrast against the darker wings and tail. The legs were long and yellow, equipped with curved nails adapted for perching and foraging among branches and tree trunks.
Sexual dimorphism was evident in the bill shape and size. Males possessed a slightly curved, light-yellow bill measuring about 4 centimeters (1.6 inches), which was well-suited for probing into crevices and handling a variety of food items. Females had a smaller, straighter bill and a crest that curved backward, distinguishing them visually from males. This difference in bill morphology may have reflected subtle variations in feeding behavior between the sexes.
Behavior & Diet
The Bourbon Crested Starling was an omnivorous bird with a diet primarily composed of insects, grains, and various fruits. Its feeding habits reflected the biodiversity of Réunion’s forests, where it exploited a range of invertebrates including beetles, caterpillars, and other arthropods. The bird’s strong, curved bill was well adapted for grasping and manipulating prey items, as well as for gleaning seeds and soft fruits from branches.
Behaviorally, the starling was likely social, as many starlings are known to form small flocks, especially outside the breeding season. These flocks may have offered protection from predators and enhanced foraging efficiency. Observers noted that the birds were agile flyers, capable of rapid maneuvers through dense forest canopies. Their long legs and sharp claws enabled them to hop and cling to branches while searching for food.
The Bourbon Crested Starling’s vocalizations are poorly documented, but as a member of the starling family, it likely had a varied repertoire of calls and songs used for communication within flocks and during courtship. Its distinctive crest may also have played a role in visual communication, signaling status or readiness to mate.
Breeding & Reproduction
While detailed studies of the Bourbon Crested Starling’s breeding behavior are lacking due to its early extinction, historical accounts and comparisons with related starling species provide some insights. The species likely nested in tree cavities or dense foliage, using natural hollows or abandoned nests of other birds found within Réunion’s forests. Nesting sites would have been chosen to provide protection from the island’s introduced predators and harsh weather. According to Cornell Lab of Ornithology, this species is well documented.
Breeding probably occurred during the warmer months when food resources such as insects and fruits were abundant. The female would lay a clutch of eggs, possibly ranging from three to five, which she incubated for approximately two weeks. Both parents likely participated in feeding the chicks, a common behavior among starlings, increasing the survival chances of the young. According to BirdLife International, this species is well documented.
Fledging would occur several weeks after hatching, with juveniles gradually gaining independence. However, predation by invasive species such as rats posed a significant threat to eggs and nestlings, severely impacting reproductive success. This predation pressure, combined with habitat loss, contributed to the decline of the species before it ultimately disappeared.
Conservation Status
The Bourbon Crested Starling is officially classified as Extinct on the International Union for Conservation of Nature (IUCN) Red List. The last confirmed sighting was in 1837 when the final known individual was reportedly shot. However, unverified reports suggest that some birds may have persisted in remote forest patches until as late as 1868. Despite these rumors, no credible evidence has surfaced to confirm survival beyond the mid-19th century.
The extinction of Fregilupus varius was primarily driven by the introduction of invasive species to Réunion, especially rats, which preyed on eggs, chicks, and adult birds. Rats are notorious for devastating island bird populations due to their opportunistic feeding habits and rapid reproduction. Additionally, the introduction of the Common Myna (Acridotheres tristis), an aggressive competitor, further stressed the Bourbon Crested Starling’s populations.
Human activity also played a significant role. Habitat destruction from deforestation for agriculture and settlement reduced the available forest area, fragmenting the bird’s habitat. Furthermore, hunting pressure by local inhabitants, who consumed the birds as a food source, accelerated the decline. These combined factors created a perfect storm that the species could not survive.
Interesting Facts
The Bourbon Crested Starling was one of several unique bird species endemic to the Mascarenes, a group of islands that includes Réunion, Mauritius, and Rodrigues. These islands were home to extraordinary avian diversity, much of which has unfortunately been lost due to human colonization and introduced species. The starling’s extinction highlights the broader story of island vulnerability and the fragile balance of island ecosystems.
Despite its extinction, the Bourbon Crested Starling remains a symbol of Réunion’s natural heritage. Museum specimens preserved in Europe offer valuable windows into its appearance and biology, enabling ongoing study. Its distinctive crest and coloration make it a favorite subject among historical bird illustrations and serve as a reminder of the importance of conserving island biodiversity today.
Interestingly, the bird’s name “Bourbon” derives from Réunion’s former colonial name, Île Bourbon, used during French rule. This ties the species closely to the island’s human history and colonial past. The term “Huppe” is French for “crest,” referencing the starling’s most striking physical attribute.
Lastly, the Bourbon Crested Starling’s extinction predates the establishment of modern conservation measures, underscoring the critical need for early intervention to protect island species before they reach the brink of disappearance.
Conclusion
The Bourbon Crested Starling (Fregilupus varius) was a remarkable bird uniquely adapted to the forests of Réunion. Its distinct crest, striking coloration, and specialized feeding behaviors made it an integral part of the island’s ecosystem. Sadly, a combination of invasive predators, habitat loss, and human exploitation led to its extinction in the 19th century, marking the loss of an irreplaceable component of Réunion’s natural world. Today, it stands as a poignant example of the vulnerability of island species and the lasting impact of human activity on biodiversity. Understanding its history reminds us of the importance of protecting remaining wildlife and habitats to prevent further extinctions in fragile island ecosystems around the globe.
