Ingo Arndt / Eastern grey kangaroos sparring {Macropus giganteus} Australia

Ingo Arndt / Two Northern elephant seal (Mirounga angustirostris) males fighting for dominance, California, USA

Ingo Arndt / Hamadryas baboon male threat display {Papio hamadryas} Africa

Ingo Arndt / Jackson's chameleons fighting {Chamaeleo jacksonii} Kenya

Ingo Arndt / Gelada baboon {Theropithecus gelada} juveniles playing on rocks, Simien Mountains NP, Ethiopia

Ingo Arndt / Gelada baboon males threat display {Theropithecus gelada} Simien Mt NP, Ethiopia

Ingo Arndt / Gelada baboon male threat display {Theropithecus gelada} Simien Mt NP, Ethiopia

Konrad Wothe / Male Chimpanzees (Pan troglodytes) attacking the alpha male of their troop, Mahale Mountains National Park, Tanzania.

Thomas Hinsche/ BIA / Common Buzzard (Buteo buteo) pair fighting, Saxony-Anhalt, Germany

Thomas Hinsche/ BIA / Common Buzzard (Buteo buteo) pair fighting, Saxony-Anhalt, Germany

SCOTLAND: The Big Picture / Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April.

SCOTLAND: The Big Picture / Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April.