Plain Prinia
Prinia inornata
These 13–14-cm long warblers have short rounded wings, a longish tail, strong legs and a short black bill. In breeding plumage, adults are grey-brown above, with a short white supercilium and rufous fringes on the closed wings. The underparts are whitish-buff. The sexes are identical. In winter, the upperparts are a warmer brown, and the underparts more buff. The tail is longer than in summer. There are a number of races differing in plumage shade. The endemic race in Sri Lanka retains summer plumage, including the shorter tail, all year round.
ID text from Wikipedia, CC BY-SA 4.0
Tawny-flanked Prinia
Prinia subflava
The tawny-flanked prinia is 11–12 cm (4.3–4.7 in) in length with a long, narrow, graduated tail and a fairly long, slender bill. The tail is often held erect or waved from side to side. The upperparts are grey-brown with rufous-brown edges to the flight feathers and a rufous tinge to the rump. The throat and breast are whitish while the flanks and vent are warm buff. There is a whitish stripe over the eye and the lores are dark. The tail feathers have a white tip and a dark subterminal band. The sexes are similar in appearance. Non-breeding birds have a longer tail than breeding birds.
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: Plain Prinia and Tawny-flanked Prinia.