The greenish warbler ring species Avibase is an extensive database information system about all birds of the world. Greenish warblers inhabit forests are very active singers, song. Central Siberia shows the contact zone between plumbeitarsus and viridanus. The two forms are connected by a long chain of populations, are in body size about 10 %. Map of Asia showing the six subspecies of the greenish warbler. The gap is the most likely result of habitat destruction.