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