David Tipling / Common cuckoo (Cuculus canorus) male being mobbed by host species Meadow pipit (Anthus pratensis) Peak District, England, UK. May.

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish prey (Loricariidae) attacked by Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish (Loraciidae) attacked by a Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..

Loic Poidevin / Hooded crow (Corvus cornix) mobbing White tailed sea eagle (Haliaeetus albicilla). Danube Delta, Romania. May.

Staffan Widstrand / Golden eagle (Aquila chrysaetos) male in conflict with Magpie (Pica pica) group, Kalvtrask, Vasterbotten, Sweden. December.

Konrad Wothe / Eider duck (Somateria mollissima) attacking Great black-backed gull (Larus marinus) defending her ducklings, North Sea, Germany, June.

Konrad Wothe / Eider duck (Somateria mollissima) attacking Great black-backed gull (Larus marinus) defending her ducklings, North Sea, Germany, June.

Markus Varesvuo / Carrion crow (Corvus corone corone) mobbing Bearded vulture (Gypaetus barbatus) Spain, November.

Espen Bergersen / Gyrfalcon (Falco rusticolus) chased by Raven (Corvus corax). Hornoya birdcliff, Vardo, Norway. March

Espen Bergersen / Gyrfalcon (Falco rusticolus) chased by Raven (Corvus corax). Hornoya birdcliff, Vardo, Norway. March

Espen Bergersen / Gyrfalcon (Falco rusticolus) with Herring gull (Larus argentatus) chasing it off, Hornoya birdcliff, Vardo, Norway. March

Espen Bergersen / Gyrfalcon (Falco rusticolus) attacked by Herring gull (Larus argentatus). Hornoya birdcliff, Vardo, Norway. March