Loic Poidevin / Northern ravens (Corvus corax) interacting in snow, Leon, Spain, February.

Marie Read / Blue jay (Cyanocitta cristata) holding an acorn in its bill whilst perched on tree stump, with autumn foliage, New York, USA, October.

Markus Varesvuo / Jay (Garrulus glandarius), two fighting in mid-air with another observing. Norway. October.

Markus Varesvuo / Jay (Garrulus glandarius), two fighting in mid-air with another observing. Norway. October.

Philippe Clement / Territorial Common raven (Corvus corax) on cliff top, tearing out vegetation, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Philippe Clement / Common raven (Corvus corax) taking off from the top of a sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Philippe Clement / Common raven (Corvus corax) calling from top of sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

David Tipling / Eurasian magpies (Pica pica) five gathering prior to going to roost Hortobagy National Park, Hungary January

Dave Bevan / Common raven (Corvus corax) flying to nest to feed fledglings, Carmarthenshire, Wales, UK, May.

Dave Bevan / Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May.

Dave Bevan / Slow motion clip of a Jay (Garrulus glandarius) feeding from a peanut string during a snowstorm, Carmarthenshire, Wales, UK, November.

Ann & Steve Toon / Pied crows (Corvus albus) perched on horns of antelope skull. Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.