The Seychelles White-eyes (Zosterops modestus) is a rare warbler-like perching bird from the family of white-eyes (Zosteropidae). It is endemic to the Seychelles.
Description
This ten to eleven centimetre long bird has a plumage with olive grey upperparts and dull-coloured underparts. It is further characterized by a white narrow eye-ring, a rather long dark grey tail, and a small sharp bill.
The Seychelles white-eye is about the size of an average sparrow. Its wingspan is 10-11 centimetres. The upper parts of the bird are a lively grey and blend in with the foliage on the trees. However, the underparts lack any bright colors. It is easily identified by the narrow white eye-ring that surrounds each eye. This, along with the sharp, small bills and somewhat slender profiles, gives it a distinct identity among white-eyed birds. The tail of this bird is long and dark gray, which helps to balance the shape when it perches amongst branches. Although not colorful, its posture, flight, and song make it noticeable to those who are aware of where to look.
Diet / Feeding
The Seychelles white-eye is a small bird with a diverse diet. It feeds on insects, locusts, and grasshoppers found in the canopies of trees, bark, and leaf litter. It also consumes seeds and berries. This provides a variety of food, especially during times when insects are less plentiful (for instance, in the off-seasons). The bird feeds on trees that have fruiting native plants and sometimes introduced species. This increases the options for it in disturbed habitats.
The feeding habits of this bird are less obvious than those of many forest birds. This is partly because they forage in protected areas such as the canopy or understory, rather than out in the open. It is a quiet bird that moves between branches to pick up insects or fruit. Its ability to adapt its diet and habitat has probably helped it survive in forest patches that have been degraded or altered.
Breeding and Nesting
Seychelles white-eyes breed from September through April. This period spans the wet and dry seasons and coincides with the availability of food and nesting conditions. It builds a nest that is cup-shaped, made of grass, moss, and spider webs. Nests are usually placed high in trees among dense foliage.
Clutch size can range from 2 to 7 eggs. This is a wide range that suggests individual birds might adjust their clutch size based on available food, habitat conditions, or other environmental factors. Incubation lasts approximately 13 to 15 days, and chicks fledge after about 11 to 16 days.
Parents continue to feed their young after fledging for approximately two months. They also help them learn about feeding behaviors, defend territory, and protect the nest. Nests in trees are difficult to observe because they are so high. Most of the information we have comes from fieldwork and occasional monitoring rather than constant observation.
Threats
It was thought to be extinct between 1935 and 1960 until it was rediscovered in the highland of Mahé.
Even in 199,6, it was considered one of the rarest birds in the world with a population of only 25 to 35 individuals.
The dramatic decline was caused by the extensive forest clearings and the competition of introduced bird species like the Common Myna and the predation by rats.
In 1997, there was a rediscovery of about 250 individuals on the Seychelles island of Conception. According to Bug Guide, this species is well documented.
In 1998, the population of Mahs increased to 50. Currently, the population on Conception Island consists of between 244 and 336 individuals. According to IUCN Red List, this species is well documented.
In 2001, there was an introduction project on the Seychelles island of Frégate. Currently, there is a population of 60 specimens on that island.
Vocal Behavior
Observers describe the Seychelles White Eye’s song as nasal tones. It is difficult to listen to it because it sings and forages high up in the trees. The song is used to attract mates, establish territories, and communicate with other white-eyes, either in pairs or flocks.
Due to its ecology, which includes a dense canopy of trees, high terrain, and limited visibility, the voice is primarily used by people to detect this bird. Hearing a white eye call is used in many conservation surveys to determine presence, even if the bird can’t be seen.
Distribution and Habitat
This bird is endemic to Seychelles. Its range, though very small, spans several islands. This bird is found on Mahe Island, Fregate Island, North Island, and Grande Soeur. It is found on these islands in high-elevation zones that are forested. However, it can also be seen in habitats such as gardens, scrubs, secondary growth, and other places where trees and canopies remain. It is found in the highland forests of La Misere and Cascade on Mahe. It can also use patches of forest on steeper terrain, where there are fewer disturbances.
Seychelles has many islands and, therefore, the habitat is fragmented. The vegetation, predators, human disturbance, and forest cover of each island are different. The presence of the White-eye on multiple islands presents both an opportunity and a challenge.
Conservation Status
IUCN has now classified the Seychelles White-eye as Vulnerable. The population of the Seychelles White-eye, which was reduced to 25 birds by mid-1990s, has now grown to approximately 220-270 individuals. This fragile recovery has been largely attributed to conservation efforts, including habitat restoration and translocations of islands.
Despite the gains made, this species is still under threat. Deforestation, development, and habitat loss continue to reduce nesting and feeding space. Rats and other introduced predators, such as competing bird species, like the Common M n, threaten survival. The species is vulnerable to local extinction due to fragmented populations on small islands. On the main island, nd M, the numbers have dropped sharply in the last few years. Loss of fruit trees, which are a vital food source, adds to the pressure. The future of the bird is uncertain due to these combined threats, especially without proactive and ongoing management.
Conservation groups responded by taking intensive action. They relocated birds to islands free of predators, managed invasive species, and monitored breeding success. This has resulted in more stable populations at Fregate Island, North Island, and other places. But, as the population on Mahe continues to decline and environmental changes continue, it is important to remain vigilant.
Conclusion
The Seychelles White Eye is both a conservation success and a challenge. The bird’s olive-grey feathers and melodic song hide its resilience, which has helped it recover from the brink of extinction. This resilience, however, is not limitless.
The survival of this bird depends on the health of forests, the control of predators, and connectivity between island populations. To protect this bird, you must also protect the ecosystems that it calls home. Each successful fledgling, each habitat preserved, and each translocation is a quiet victory for biodiversity.
It is one of the rarest species in the Seychelles and reminds us that small species are easily lost, but can be saved if we act quickly.
