Large Elaenia

Medium-sized greenish bird with a bright yellow underside and black head. Occurs in a variety of habitats, wherever there are trees, including forest, open woodlands, and gardens, in the lowlands and foothills. Usually encountered in pairs or small groups. Yellow throat and lack of black in the wing separates this species from Black-hooded Oriole. Unmarked, black head identifies Black-capped Bulbul from Yellow-eared and Yellow-browed Bulbuls. Song is series of warbling whistles, rising at the end, “wet-wet-wet-wer-wer-wer-weer.” Also gives churring calls.

A large, long-winged, entirely gray-brown swiftlet with a very shallow tail fork and a gliding flight action. Found over a variety of habitats, often in flocks with other swiftlets. Almost always seen in flight. Widespread, so overlaps with multiple similar swiftlets. Uniform Swiftlet is larger and longer-winged than Glossy, Cave, and Bornean Swiftlets, with a dark belly and a non-fluttering flight action. Uniform Swiftlet lacks the clear pale rump of White-rumped, Seram, Halmahera, Sulawesi, and some Glossy Swiftlets, and is larger than those species. Uniform lacks gloss on upperparts, unlike Mayr’s, Mountain, and Glossy Swiftlets. It is smaller than Bare-legged, Mayr’s, Papuan, Volcano, and Giant Swiftlets. It is most similar to Edible-nest and Black-nest Swiftlets, but Uniform is darker beneath, and lacks the slightly paler rump of Edible-nest; it is best distinguished from those species by its mossy nest. 

Dark olive-green upland specialist, restricted to Borneo’s central highlands, where it inhabits mossy forest, stunted growth, and even pockets of sparse growth above the treeline; one of the most common species at the highest elevations. Black eye patch and slender red bill are unique. Forages at all levels, often in pairs or small flocks. Song is a series of pleasantly melodic fluty whistles, often heard in the early morning; gives various tweeting, chirring calls.