Staffan Widstrand / Golden eagle (Aquila chrysaetos) perched in snow covered tree. Kalvtrask, Vasterbotten, Lapland, Sweden. January.

Staffan Widstrand / Golden eagle (Aquila chrysaetos) in flight over snow. Kalvtrask, Vasterbotten, Lapland, Sweden. January.

Juan Carlos Munoz / Griffon vulture (Gyps fulvus) landing on coast next to flock. Cantabria, Spain, March.

Sven Zacek / White-tailed sea eagle (Haliaeetus albicilla) flying over frost and snow covered forest. Tartumaa, Southern Estonia. January 2011.

David Perpinan / Group of Griffon vultures (Gyps fulvus) fighting to feed on a dead lamb. Cuenca, Spain, August.

David Perpinan / Group of Griffon vultures (Gyps fulvus) arriving and feeding on a dead lamb, Cuenca, Spain, August.

Nick Garbutt / Bearded vulture (Gypaetus barbatus) in flight with the out-of-focus moon behind. Ladakh, Himalayas, northern India.

Staffan Widstrand / Wild Wonders of China / Chinese Sparrowhawk (Accipiter soloensis) flying Guangshui, Hubei province, China. July.

Guy Edwardes / African fish eagle (Haliaeetus vocifer), Savuti, Botswana.

Sergey Gorshkov / Northern goshawk (Accipiter gentilis) flying with squirrel prey, Finland . March

Sergey Gorshkov / Northern goshawks (Accipiter gentilis) fighting over squirrel carcass, Finland, March.

Danny Green / Bald eagle (Haliaeetus leucocephalus) in flight, Alaska, USA, February