Dong Lei / Chestnut-headed Tesia (Tesia castaneocoronata) perched, Sichuan Province, China.

Eric Sohn Joo Tan/ BIA / Slaty-bellied Tesia (Tesia olivea), Bidoup Nui Ba National Park, Vietnam

David Tipling / Cetti's warbler (Cettia cetti) Northern Israel, January

John Waters / Cetti's Warbler (Cettia cetti) singing in reeds at dawn, Ham Wall RSPB Reserve, Somerset Levels, England, UK, December.

Dong Lei / Chestnut-crowned bush-warbler (Cettia major) perched, Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Tibet, China.

Dong Lei / Yellowish-bellied Bush Warbler (Cettia acanthizoides) Tangjiahe National Nature Reserve, Sichuan Province, China, Asia

Aflo / Bush Warbler (Cettia diphone) profile, Tokyo, Japan, January.

Robin Chittenden / Cetti's warbler (Cettia cetti) perched on twig, Strumpshaw Fen RSPB, Norfolk, UK, June.

Robin Chittenden / Cetti's warbler (Cettia cetti) perched on twig, Strumpshaw Fen RSPB, Norfolk, UK, June.

Ralph Martin / Cetti's Warbler (Cettia cetti), Cyprus

Andres M. Dominguez / Cetti's Warbler (Cettia cetti), Cadiz, Spain

Eric Sohn Joo Tan/ BIA / Slaty-bellied Tesia (Tesia olivea), Bidoup Nui Ba National Park, Vietnam

Eric Sohn Joo Tan/ BIA / Sunda Bush-Warbler (Cettia vulcania), Sabah, Borneo, Malaysia

Ralph Martin/ BIA / Streaked Scrub-Warbler (Scotocerca inquieta), Morocco

Robin Chittenden / Cetti's warbler (Cettia cetti) Suffolk, England, UK, April.

Robin Chittenden / Cetti's warbler (Cettia cetti) perched, Suffolk, UK, April.

David Tipling / Cetti's warbler (Cettia cetti) perched on branch singing, Norfolk, England, UK. May.

David Tipling / Cetti's warbler (Cettia cetti) perched in tree singing, Kent, England, UK. April.

Tom Vierus / Fiji bush warbler (Horornis ruficapilla) perched on a vine, Colo-i-Suva Rainforest Park, Viti Levu, Fiji.

Mike Read / Cetti's warbler (Cettia cetti) standing in grass, Ham Wall RSPB Reserve, Somerset, England, UK. March.

David Tipling / Male Cetti's warbler (Cettia cetti) perched on a branch, Lakenheath, Suffolk, UK. May.

Robin Chittenden / Cetti's warbler (Cettia cetti) perched on thorny branch, Thorpe Marshes Norwich UK, April.

Markus Varesvuo / Asian stubtail (Urosphena squameiceps). Happy Island, China. May.

David Tipling / Cetti's warbler (Cettia ceti) Snettisham, Norfolk, autumn

David Tipling / Cetti's warbler (Cettia ceti) Snettisham, Norfolk, England, UK, September.

Staffan Widstrand / Wild Wonders of China / Rufous-faced warbler (Abroscopus albogularis) Lalashan Forest Reserve, Baling, Taiwan

Fabian Muhlberger / Wild Wonders of China / Rufous-faced warbler ( Abroscopus albogularis ) in Bamboo thicket, Taiwan.

Robin Chittenden / Cetti's warbler (Cettia cetti) perched in Alder (Alnus glutinosa) tree. Thorpe Marshes, Norwich, Norfolk, UK. April.

Robin Chittenden / Cetti's warbler (Cettia cetti) male singing, perched in tree. Thorpe Marshes, Norwich, Norfolk, UK. April.

David Perpinan / Cetti's warbler (Cettia cetti) searching for food, Besos river, Barcelona, Spain, March.