Savi's Warbler

Savi's warbler is about 14 centimetres long, with uniform dark reddish-brown upperparts that sometimes have a slight greenish tinge, indistinct buff eye-stripes, dark lores and pale brown ear-coverts. The beak is slender and brown, and the chin, throat and belly are whitish-buff, with the rest of the underparts sandy brown. The lack of throat streaks separates it from the river warbler. The song is a trill very like the grasshopper warbler's but slightly lower and less prolonged, often preceded by a series of low ticks that merge into the trill. (Wikipedia, general species account)

This small insect-eating warbler breeds in Europe and the western Palearctic and is migratory, wintering in northern and sub-Saharan Africa. It is found in reed beds, usually with some bushes, and lays three to six eggs in a nest in the reeds. The sexes are identical, as with most warblers, but young birds are yellower below. (Wikipedia, general species account)