Overview
Hose’s Broadbill (Calyptomena hosii) is an incandescent, jewel-like suboscine passerine endemic strictly to the rugged central highlands of Borneo. Named in honor of colonial naturalist Charles Hose, this secretive frugivore combines vivid electric-cyan and glittering emerald plumage with a gentle, ponderous disposition, illuminating the shadowy understory of Borneo’s ancient submontane dipterocarp rainforests.
Biology and Physical Characteristics
Measuring around eight inches in length, Calyptomena hosii displays sensational sexual dichromatism. Adult males boast a brilliant sky-blue belly and breast that contrasts breathtakingly against shimmering iridescent emerald-green wings and back. The wings are intricately marked with three bold black bars and a velvety black patch behind the eye. Like other broadbills, it features an exaggerated, rounded tuft of forehead feathers that completely conceals its broad, hooked bill, enhancing its compact, spherical silhouette.
Behavior and Ecology
Hose’s Broadbill inhabits middle to sub-canopy layers of montane forests, typically found perched quietly along mossy vines and horizontal branches. It is primarily a specialized frugivore, using its broad, gaping bill to pluck and swallow whole wild figs, berries, and melastome fruits, serving as an indispensable seed disperser for native flora. Pairs construct elaborate, pear-shaped hanging nests woven from green moss, lichens, and fungal hyphae suspended above mountain streams to deter arboreal predators.
Conservation and Human Impact
Categorized as Near Threatened on the IUCN Red List, Hose’s Broadbill faces ongoing habitat decline from commercial logging, agricultural expansion, and hydroelectric infrastructure projects that encroach on mid-elevation hill forests. Fortunately, significant portions of its upland range fall within well-managed protected areas, including Gunung Mulu National Park in Sarawak and Kayan Mentarang National Park in Kalimantan, which remain vital strongholds for its survival.
Interesting Factoid
The frontal crest of Hose’s Broadbill is so dense that it functions like an ornate green pom-pom, completely hiding the base of its bill so that only the tiny tip of the beak is visible when viewed head-on.
Last updated: October 2026