Yellow-vented warbler

The yellow-vented warbler (Phylloscopus cantator) is a species of leaf warbler (family Phylloscopidae). It was formerly included in the "Old World warbler" assemblage. It is found in Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, and Thailand. Its natural habitat is subtropical or tropical moist montane forests.

Description
The yellow-vented warbler has a mass of 6-7 g and a size of about 11 cm (4.3 in).