Brian Bevan / Long tailed tit (Aegithalos caudates) nest building, Bedfordshire, England, UK, April.

Colin Varndell / Long-tailed tit (Aegithalos caudatus) profile portrait, Dorset, UK February

Ben Hall / Long tailed tits (Aegithalos caudatus) pair perched on pine branch in snowfall, Cheshire, UK March

Grzegorz Lesniewski / Long-tailed Tit (Aegithalos caudatus) portrait. Bieszczady National Park, the Carpathians, Poland, March.

Stephen Dalton / Blue tits (Parus caeruleus) feeding at nut feeder, Long tailed tit (Aegithalos caudatus) flying to feeder, UK

Andy Rouse / Long tailed tit (Aegithalidae caudatus) perched on branch, UK

WILLIAM OSBORN / Long tailed tit & sallow flowers UK

Ashley Cooper / Long-tailed tit (Aegithalos caudatus) gathering feathers for nest. May.

John Chan / Female Bushtit (Psaltriparus minimus) returning to nest to feed chicks, carries away a fecal sac, Southern California, USA, April.

John Chan / Bushtit (Psaltriparus minimus) returning to nest to feed chicks, Southern California, USA, April.

John Chan / Female Bushtit (Psaltriparus minimus) departing from nest as the male returns to feed chicks, Southern California, USA, April.

Fabrice Cahez / Long-talled tit (Aegithalos caudatus) perched, Vosges, France, April.