Ingo Arndt / Flock of Rooks (Corvus frugilegus) roosting in tree at dusk, Hessen, Germany, Europe

Ingo Arndt / Thick billed ravens interacting {Corvus crassirostris} Simien NP, Ethiopia, East Africa

Mark Hamblin / Raven (Corvus corax) adult calling from rock in mountain habitat, Scotland, UK. November. Third place in British Birds Bird Photograph of the Year competition 2016.

Bence Mate / Hooded crow (Corvus cornix) mobbing Buzzard (Buteo buteo) Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.

Bence Mate / White tailed sea eagle (Haliaeetus albicilla) and Hooded crow (Corvus cornix) in snow, Lake Csaj, Kiskunsagi National Park, Hungary. January.

Bence Mate / Juvenile White tailed eagle (Haliaeetus albicilla)in flight, with Hooded crow (Corvus cornix) mobbing it, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.

David Pattyn / Alpine chough (Pyrrhocorax graculus) group in flight, Bernese Alps, Switzerland, November

Jussi Murtosaari / Common magpies (Pica pica) perched on frost covered branches, Jvaskyla, Finland, January.

Mark Hamblin / 2020VISION / Jackdaw (Corvus monedula) taking a bundle of wool into a nest hole in tree, Inverness-shire, Scotland, UK, April 2011

Mark Hamblin / 2020VISION / Jackdaw (Corvus monedula) pair at their nest hole, one pecking the other for attention, the other quivering its tail, Inverness-shire, Scotland, April 2011

Mark Hamblin / 2020VISION / Jackdaw (Corvus monedula) pulling a very long twig into a small nest hole, Inverness-shire, Scotland, UK, April 2011

Markus Varesvuo / Silhouette of Hooded Crow (Corvus cornix) against full moon, Helsinki, Finland, December