Phylloscopidae

Phylloscopidae, the leaf warblers, is a family of small insectivorous passerine birds in the single genus Phylloscopus, comprising 80 species; the family was previously classified within the Old World warblers before being established on its own in 2006. Leaf warblers occur across Eurasia, into Wallacea and Africa, with one species, the Arctic warbler, breeding as far east as Alaska, and many temperate-breeding species migrate to southeastern Asia, India or Africa for the winter. They are notably small birds, 3.5 to 17 grams in body mass and 9 to 14.5 centimeters long, mostly greenish or brownish above and off-white or yellowish below, with 12 tail feathers distinguishing them from similar-looking birds. Leaf warblers are active, constantly moving birds that flick their wings while gleaning foliage for insects at various forest levels, are markedly territorial, and sing comparatively simple songs. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/