Tachybaptus ruficollis
Small, dark grebe with bright yellow gape, short neck and bill. Winter plumage paler than summer, with chestnut flanks, neck and cheeks, giving much less contrast between upper- and underparts than in Slavonian Grebe. Fluffy, pale stern. No crest or tufts/tippets and no white markings on wings.
Relatively vocal compared to many other grebes. Call; sometimes a single quite clear high pitched "dydlylyyt". More often combined into longer phrases with harsher quality, oscillating like laughter and travelling up and down in pitch in agitated motion. Reminiscent of female Cuckoo.
Xeno-canto: map
Birdlife ecology