Crocker Jungle Flycatcher

A thrush-sized bird with a heavy bill, olive-green upperparts, and a yellow underside. Particularly note the yellow cheeks and the yellowish patch beside the bill, making the dark eye stand out from the face. Pairs and small groups inhabit forests, edges, scrubland, and plantations. Confined to the island of Obi. Separated from female Black-chinned Whistler by unscaled throat, solid yellow underside,  and yellow facial sides. Vocalizations include an inflected high-pitched whistle, “tseeooeee.” Also gives a staccato, two-note “wit-cheer” with a longer second note, plus nasal “too-too” calls.

Secretive long-tailed babbler. Black-and-white streaking on neck is distinctive if seen well. Otherwise, note white underparts and streaking on back and crown. A lowland waterside vegetation specialist; favors reedbeds and wet grasslands. Quite difficult to see; most easily detected by voice. Song is a descending note followed by a burst of warbles; gives a variety of calls, including a harsh nasal mew. 

Fairly dull vireo, intermediate between Blue-headed and Plumbeous. Grayish-olive overall, but with yellowish flanks and greenish back. Note white spectacles contrasting with gray head and two whitish wingbars. Breeds in mixed coniferous forests, especially in mountainous areas; winters in Mexico. Often separable from Blue-headed and Plumbeous Vireos by range, but can overlap during migration and winter. Cassin's is less contrasty than Blue-headed, especially between the gray face and whitish throat, and the greenish back blends into the nape and crown. Some birds are best left unidentified.