Konrad Wothe / Pair of European nuthatches (Sitta europaea) mating, Bavaria, Germany, April.

Alan Murphy/ BIA / White-breasted Nuthatch (Sitta carolinensis), Arizona

Donald M. Jones / Red-breasted Nuthatch (Sitta canadensis) chick in nest cavity, western Montana

Donald M. Jones / Red-breasted Nuthatch (Sitta canadensis), western Montana

Pål Hermansen,Pal Hermansen / Nuthatch (Sitta europaea) chasing away and Black tit (Periparus ater) in car graveyard, Varmland, Sweden, December

Donald M. Jones / Red-breasted Nuthatch (Sitta canadensis), North America

Donald M. Jones / Red-breasted Nuthatch (Sitta canadensis) perching on pine cones, North America

Oscar Dewhurst / Velvet-fronted nuthatch (Sitta frontalis) on tree trunk. Goa, India.

Staffan Widstrand / Wild Wonders of China / Velvet-fronted nuthatch (Sitta frontalis) Tongbiguan nature reserve, Dehong, Yunnan, China

Loic Poidevin / Eurasian nuthatch (Sitta europaea) on tree trunk, Leon, Spain, February.

Loic Poidevin / Eurasian nuthatch (Sitta europaea) on tree trunk, Leon, Spain, February.

Pedro Narra / European nuthatch (Sitta europaea) perched on tree trunk, Sado Estuary, Portugal. November