Gray-headed Oliveback

A medium-sized white cockatoo with a yellow crest; rare and endangered throughout its native range but has several strong naturalized populations across Asia. Raucous and social, usually seen in large flocks flying noisily over forested areas. Noticeably smaller than the similarly-colored Sulphur-crested Cockatoo; no natural range overlap, but the two coexist in parts of their introduced range, such as Singapore.

A skulky, dull brown warbler with a long and graduated tail, a pale grayish eyebrow, and a throat that is lightly streaked. It creeps around mouse-like in thick undergrowth and tangles in forest and forest edge. It is also found in isolated pockets of scrub, often adjacent to streams, and is frequently detected and identified by its song, mostly delivered between September and December: 2-3 sweet “tsiit” notes followed by a loud trill of 15-20 harsh “tchui” notes. It also has a strident chipping alarm call “tddd-ddr-ddr-ddr-ddr-tt.” The similar Knysna Warbler differs from Barratt’s Warbler by its shorter tail, darker underparts, less pronounced throat streaking, and different song.

Distinctive but variable: all plumages are some bold combination of black, white, and gray. Shows considerable variation in plumage across the world, but never has a clear, thin and contrasting eye-brow like White-browed or Japanese Wagtail. Occurs in varied open habitats, from wild grassy areas and wetlands to paved car parks and grassy lawns. Usually seen as singles, pairs, or small groups walking and running around, pumping the long, white-sided tail up and down. Identified easily in flight by its loud, thick and distinctive “tsee-tsee’ call.