Phylloscopidae

The species are of various sizes, often green-plumaged above and yellow below, or more subdued with greyish-green to greyish-brown colours, varying little or not at all with the seasons. The tails are not very long and contain 12 feathers (unlike the similar Abroscopus species, which have 10 tail feathers). Many species are more easily identified by their distinctive songs than their dull plumage. These are very small passerines with adult body masses that can vary from 3.5 to 17 g (0.12 to 0.60 oz) and in some cases, such as the Chinese leaf warbler, are among the lightest passerines anywhere. Several of the larger species are similar in size including the large-billed leaf warbler, Radde's warbler and the pale-legged leaf warbler. Total length can vary from 9 to 14.5 cm (3.5 to 5.7 in).