Sulphur-bellied Warbler

The Sulphur-bellied warbler is a dark Phylloscopus warbler, with dark grey upperparts, a strong yellow eyebrow stripe and brownish-yellow underparts. It lives up to its name of stone warbler by breeding on dry, stony mountain slopes with low vegetation and scattered juniper and Himalayan pine, mainly at or above the tree line. In winter it is seen at lower levels, below 1,500 metres, in dense undergrowth in broadleaf woods but also in stony areas, steep ravines and around old walls or buildings. (Swedish Wikipedia, general species account)

It eats mainly small insects, above all small beetles such as weevils, and larvae, foraging alone or in pairs, mostly on the ground, where it moves like a dunnock. It can also be seen creeping sideways on tree trunks like a treecreeper and along larger branches like a nuthatch. It breeds from late April to early August; the female builds a ball of grass, plant fibres and feathers up to 1.5 metres above the ground in a dense bush and lays four or five eggs incubated for 14–17 days, and both parents feed the young. (Swedish Wikipedia, general species account)