Adult, Animal, Argentina, Argentine Republic, Bird, Blastocerus dichotomus, Blastocerus sp, Buck, Cattle Tyrant, Cervidae, Color Photograph, Day, Deer, Even-toed Ungulate, Full Length, Horizontal, Ibera Provincial Reserve, Ibera Wetlands, Looking, Looking at Camera, Machetornis rixosa, Machetornis rixosa rixosa, Machetornis sp, Male, Mammal, Marsh Deer, Minden Represented, Mutualism, Nature Reserve, Nobody, Outdoors, Side View, South America, Symbiosis, Threatened, Threatened Species, Two Animals, Tyrannidae, Tyrant Flycatcher, Tyrant-Flycatcher, Ungulate, Vulnerable, Vulnerable Species, Wildlife