great skua (stercorarius skua

great skua stercorarius bonxie catharacta sea hawk arctic birds attack kleptoparasitism ocean franz josef land adult bird aggressive animal circle guide birder birding tour cold desert flesh eater flesheater fowl freebooting harpy kite light morph joseph looter marauder nature northern ornithology parasitic jaeger piracy polar predator raptor robber seabird shark tundra vulture wildlife wolf food parasitism