Tony Phelps / Rhombic Egg-eating Snake (Dasypeltis scabra) in nest of Cape Weaver bird (Poceus capensis). Little Karoo, Western Cape, South Africa, January.
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Sebastian Kennerknecht / Mountain Lion (Puma concolor) biologist, Sean McCain, determining location of collared puma and land ownership in the surrounding area, Santa Cruz Puma Project, Santa Cruz Mountains, California
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Nick Upton / Common / Eurasian crane (Grus grus) pair Monty and Chris released by the Great Crane Project, bugling in unison on partially flooded pastureland to proclaim ownership of their territory, Slimbrigde, G...
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Duncan Usher / Great Crested Grebe (Podiceps cristatus) pairs disputing rightful ownership over nest platform, Germany. Sequence 3 of 3
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Duncan Usher / Great Crested Grebe (Podiceps cristatus) pairs disputing rightful ownership over nest platform, Germany. Sequence 2 of 3
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Duncan Usher / Great Crested Grebe (Podiceps cristatus) pairs disputing rightful ownership over nest platform, Germany. Sequence 1 of 3
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Roberto Rinaldi / The stone money of Yap (rai) has no legal tender on the international currency market but they are still used as legal tender on the islands. The value varies but not according to size as one would be...
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Roberto Rinaldi / The stone money of Yap (Rai) has no legal tender on the international currency market but they are still used as legal tender on the islands. The value varies but not according to size as one would be...
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Hermann Brehm / Green woodpecker (Picus viridis) male, fighting with a Starling (Sturnus vulgaris) for ownership of a nest hole, Germany. April.
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Roger Powell / Lesser kestrel (Falco naumanni) males disputing ownership of a nest hole, Alcantara church, Alcantara, Extremadura, Spain.
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Roger Powell / Lesser kestrel (Falco naumanni) males fighting over ownership of a nest hole, Alcantara church, Alcantara, Extremadura, Spain.
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Roger Powell / Lesser kestrel (Falco naumanni) females fighting over ownership of a nest site in a church wall, Alcantara church, Alcantara, Extremadura, Spain.
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Roger Powell / Two Black-legged Kittiwake (Rissa tridactyla) squabbling over ownership of a nest, Howick Haven, Nothumberland, UK. March.
