Common Grasshopper Warbler
Locustella naevia
The adult is about 12.5 cm (5 in) long, and weighs 11.5–16 grams (0.41–0.56 oz). It is a secretive bird and can be hard to see, but its presence is easily detected because of its characteristic song. The upper-parts are pale olive-brown, each feather having a central darker brown streak. The cheeks are greyish, the irises are brown and there is a faint eye streak behind the eye. The upper mandible of the beak is dark brown and the lower mandible yellowish-brown. The underparts are cream-coloured or yellowish-buff with a few dark brown spots and streaks on the breast and flanks.
ID text from Wikipedia, CC BY-SA 4.0

Taiwan Bush Warbler
Locustella alishanensis
The Taiwan bush warbler is about 14 cm (5.5 in) long and weighs about 10 g (0.35 oz). The male and female are alike. The head is dull rufous-brown, the crown having narrow dark tips. The indistinct supercilium and eye-ring are pale buff. The upperparts, from the mantle to the wings and tail, are dull russet-brown. The chin and throat are white, the lower throat usually having spots. The upper breast is greyish brown, and the lower breast and belly are white. The undertail coverts are dark rufous-brown with warm-coloured tips.
ID text from Wikipedia, CC BY-SA 4.0
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Common Grasshopper Warbler and Taiwan Bush Warbler.