Yciowys

The Yciowys are a small, nocturnal seabird native to the Vaelian Archipelago in the southern seas. They measure about 15 to 18 centimeters in length with a slim body, short wings, and a compact bill. Plumage is predominantly muted gray on the upperparts and pale on the underparts, with a faint iridescent patch at the nape that is most visible in moonlight. They are the sole representative of the genus Yciowys.

Habitat and range: They breed in dense cliffside colonies on remote islands, laying eggs in crevices and ledges. Foraging occurs at night over open water within roughly 20 to 60 kilometers of breeding sites. In winter, some individuals migrate short distances to sheltered bays, though many stay near their natal islands.

Diet and behavior: Yciowys feed mainly on small fish and calamaroids, taking prey by swift plunge dives or surface pursuit. They are highly social at sea, forming mixed flocks during the nonbreeding season and returning to breeding colonies at dusk.

Reproduction: They are believed to be monogamous, with both parents sharing incubation and chick-rearing duties. A single egg is typically laid per season, incubated for about 22–26 days. Chicks fledge after 28–40 days and reach independence gradually.

Conservation: The population is small and fragmented, with several thousand mature individuals estimated in total. Primary threats include introduced predators, nest disturbance, and shifts in prey distribution due to climate change. Protected breeding sites and predator-control programs have been established on key islands.

Etymology and cultural significance: The name Yciowys comes from the Vaelian word for “twilight wanderers.” In local folklore, Yciowys symbolize resilience and night navigation, and their calls feature in seasonal songs and navigation rites.