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What the Mountain Chiffchaff sounds like

When to see the Mountain Chiffchaff
One bar for each month. Filled bars are the 7 months with records; pale bars are months with none. The wide bar is May, the month with the most records.
Where to see the Mountain Chiffchaff
The map shades 14 countries with regular records, and 3 more in a lighter tone where the bird turns up only as a stray. Everything unshaded has no records. Countries are listed below the map.
About the Mountain Chiffchaff
The mountain chiffchaff or eastern chiffchaff is a species of leaf warbler found in the Caucasus and Tian Shan. It is an altitudinal migrant, moving to lower levels in winter. The nominate subspecies is similar to the Siberian chiffchaff, but with a finer darker bill, browner upperparts and buff flanks; its song is almost identical to the common chiffchaff, but the call is a weak psew. P. s. lorenzii is warmer and darker brown than the nominate race; it is sympatric with common chiffchaff in a small area in the Western Caucasus, but interbreeding occurs rarely, if ever. The mountain chiffchaff differs from tristis in vocalisations, external morphology and mtDNA sequences.
Text adapted from Wikipedia, licensed CC BY-SA 4.0.
Easily confused with
Grey-cheeked WarblerPhylloscopus poliogenysThe grey-cheeked warbler is a species of leaf warbler.
Davison's Leaf WarblerPhylloscopus intensiorDavison's leaf warbler or the white-tailed leaf warbler, is a species of leaf warbler.
Claudia's Leaf WarblerPhylloscopus claudiaeClaudia's leaf warbler is a leaf warbler found only in China.
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