Gabriel Rojo / Cattle tyrant (Machetornis rixosus) perched on capibara (Hydrochoerus hydrochaeris) Ibera Marshes, Corrientes Province, Argentina
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Gabriel Rojo / Marsh deer (Blastocerus dichotomus) male with Cattle tyrant (Machetornis rixosus) on back, Ibera Marshes, Corrientes Province, Argentina.
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Patricio Robles Gil / Silhouetted Capivara / Capibara (Hydrochoerus hydrochaeris) with Cattle Tyrant (Machetornis rixosa), which feeds on flies approaching the Capibara. Parana, Southern Brazil.
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Konrad Wothe / Cattle Tyrant (Machetornis rixosa) on Capybara (Hydrochoerus hydrochaeris), Pantanal, Brazil
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Gabriel Rojo / Marsh deer (Blastocerus dichotomus) male with Cattle tyrant (Machetornis rixosus) Ibera Marshes, Corrientes Province, Argentina
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Thomas Marent / Cattle Tyrant (Machetornis rixosa), Guajira Peninsula, Colombia
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Gabriel Rojo / Fork-tailed flycatcher (Tyrannus savana) sitting on wire fence in front of Domestic cow, La Pampa, Argentina
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Tony Heald / Cattle tyrant (Machetornis rixosa) stretching wing, Pantanal, Brazil
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Tony Heald / Capybara (Hydrochoerus hydrochaeris) female with young, also with Cattle tyrant (Machetornis rixosa) on her back, Pantanal, Brazil
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Ben Cranke / Wattled Jacana (Jacana jacana), Cattle Tyrant (Machetornis rixosa) on Capybara (Hydrochoerus hydrochaeris) Mato Grosso, Pantanal, Brazil. July.
Angelo Gandolfi / Cattle Tyrant (Machetornis rixosa) Pantanal, Brazil
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Angelo Gandolfi / Cattle Tyrant (Machetornis rixosa) Brazil
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Angelo Gandolfi / Cattle Tyrant (Machetornis rixosa) next to cow investigating aquatic plants, Pantanal, Brazil.
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Paul Williams / Cattle tyrant (Machetornis rixosa) Pantanal, Brazil
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Paul Williams / Capybara (Hydrochoerus hydrochaeris) with Cattle tyrant (Machetornis rixosa) bird on its back looking for insects to feed on, Pantanal, Pocone, Brazil
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Paul Williams / Cattle tyrant (Machetornis rixosa) Pantanal, Brazil
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Paul Williams / Capybara (Hydrochoerus hydrochaeris) with Cattle tyrant (Machetornis rixosa) bird on its back looking for insects to feed on, Pantanal, Pocone, Brazil
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Luiz Claudio Marigo / Cattle Tyrant (Machetornis rixosa) with insect in its beak. The Pantanal wetlands of Mato Grosso State, Brazil, November.
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Mary McDonald / Cattle Tyrant (Machetornis rixosus) riding on the head of a Capybara (Hydrochoerus hydrochaeris) moving through swampland. The Tyrant flycatcher is hunting for insects disturbed by the rodent. Pantana...
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Theo Allofs / Cattle Tyrant (Machetornis rixosa) birds on Capybara (Hydrochoerus hydrochaeris) in swamp, Pantanal, Brazil
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Staffan Widstrand / Capybara {Hydrochoerus hydrochaeris} with Cattle tyrant bird on back, Brazil.
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Hiroya Minakuchi / Cattle Tyrant (Machetornis rixosa) on Capybara (Hydrochoerus hydrochaeris), Pantanal, Brazil
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Hiroya Minakuchi / Cattle Tyrant (Machetornis rixosa) on Capybara (Hydrochoerus hydrochaeris), Pantanal, Brazil
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Agustin Esmoris / Cattle Tyrant (Machetornis rixosa), Argentina
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Sebastian Kennerknecht / Marsh Deer (Blastocerus dichotomus) buck feeding on aquatic plants in marsh with Cattle Tyrant (Machetornis rixosus) on back, Ibera Provincial Reserve, Ibera Wetlands, Argentina
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Sebastian Kennerknecht / Capybara (Hydrochoerus hydrochaeris) sub-adult grazing with Cattle Tyrant (Machetornis rixosa) foraging for insects, Ibera Provincial Reserve, Ibera Wetlands, Argentina
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Sebastian Kennerknecht / Marsh Deer (Blastocerus dichotomus) buck in marsh with Cattle Tyrant (Machetornis rixosus) on back, Ibera Provincial Reserve, Ibera Wetlands, Argentina
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Sebastian Kennerknecht / Marsh Deer (Blastocerus dichotomus) buck in marsh with Cattle Tyrant (Machetornis rixosus) on back, Ibera Provincial Reserve, Ibera Wetlands, Argentina
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Sebastian Kennerknecht / Cattle Tyrant (Machetornis rixosa) on Capybara (Hydrochoerus hydrochaeris), Ibera Provincial Reserve, Ibera Wetlands, Argentina
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Agustin Esmoris / Cattle Tyrant (Machetornis rixosa), Buenos Aires, Argentina
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Roland Seitre / Capybara (Hydrochoerus hydrochaeris) with Cattle tyrant (Machetornis rixosus) Venezuela.
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Bruce Thomson / Cattle tyrant (Machetornis rixosa) standing on ground, Pocone, Brazil.
