Michael D. Kern / Variable / Thayer's kingsnake (Lampropeltis mexicana thayeri) captive, from Central Americca

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

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

Robin Chittenden / Spectacled warbler (Sylvia conspicillata orbitalis), male perched in shrub, Fuerteventura, Canary Islands, Spain. February.

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

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

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.

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

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

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.

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.

Ewan Flynn / Dartford warbler (Sylvia undata) male, perched on Gorse (Ulex sp.) bush, singing, Thursley Common, Surrey, UK. April.

Ewan Flynn / Dartford warbler (Sylvia undata) male, perched on Gorse (Ulex sp.) bush, Quantock Hills, Somerset, UK. April.

Mick Jenner / Blackcap (Sylvia atricapilla) male perched in a bush and singing. The bird jumps further up the bush and then leaves the frame. River Honndu, Pany, near Abergavenny, South Wales.

David Tipling / Dartford warbler (Sylvia undata) male, in song perched in Gorse (Ulex sp.) bush, North Norfolk, UK. May.

David Tipling / Dartford warbler (Sylvia undata) male, in song perched in Gorse (Ulex sp.) bush, North Norfolk, UK. May.

David Tipling / Dartford warbler (Sylvia undata) male, in song perched in Gorse (Ulex sp.) bush, North Norfolk, UK. May.

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

Ugo Mellone / African desert warbler (Sylvia deserti) standing in the shade of a bush, Sahara desert, Erg Chebbi, Southern Morocco, Africa.

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

Nick Upton / Common whitethroat (Sylvia communis) perched in Willow (Salix sp.) bush in scrubland, Knepp Estate, Sussex, UK, June.

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

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

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

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.

Mick Jenner / Dartford warbler (Sylvia undata) singing from a gorse bush, Dorset, England, UK, April.

Andy Sands / Whitethroat (Sylvia communis) male searching for flies around Hawthorn bush, Hertfordshire, England, UK, May