Adult red-footed booby (Sula sula) being attacked in flight by a great frigatebird (Fregata minor) in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Juvenile grey heron (Ardea cinerea) in flight, escaping from an aggressive rival in a territorial dispute, Rutland Water, Rutland, England, United Kingdom, Europe

Adult Brunnich's guillemots (Uria lomvia) in a territorial dispute at Alkefjellet, Spitsbergen, Svalbard, Norway, Europe

A combative male iguana bloodied in territorial battle. Santiago Island, Galapagos.S(marine iguana)S(territorial dispute)S(Galapagos)S(UW)

Red fox (Vulpes vulpes) males in territorial confrontation. Montreal Botanical Garden. Quebec. Canada