Andy Sands / Dartford warbler (Sylvia undata) perched on Gorse bush, Hampshire, England, UK, May

Andy Sands / Dartford warbler (Sylvia undata) singing from Gorse bush, Hampshire, England, UK, May

Rolf Nussbaumer / Yellow Warbler (Dendroica petechia), adult male perched on Elbow bush (Forestiera pubescens) with berries, Hill Country, Texas, USA. May

Nick Upton / Dartford warbler (Sylvia undata) female peering from a dead Gorse bush, Bicton Common, Exmouth, Devon, UK, June.

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

Dong Lei / Spotted bush warbler (Bradypterus thoracicus) Tangjiahe National Nature Reserve, Qingchuan county, Sichuan Province, China, August.

Dong Lei / Spotted bush warbler (Bradypterus thoracicus) Tangjiahe National Nature Reserve, Qingchuan county, Sichuan Province, China, August.

Dong Lei / Spotted bush warbler (Bradypterus thoracicus) feeding, Qingchuan county, Tangjiahe National Nature Reserve, Sichuan Province, China, August.

David Tipling / Dartford warbler (Sylvia undata) in Gorse bush, Norfolk, UK, May.

Hanne & Jens Eriksen / Baikal bush warbler (Locustella davidi) on ground, Thailand, February

Markus Varesvuo / Tristram's Warbler (Sylvia deserticola) perched in bush, Morocco, March

Dong Lei / Spotted Bush-Warbler (Bradypterus thoracicus) perched, Tangjiahe National Nature Reserve, Sichuan Province, China, Asia