Many birds in the family Tyrannidae are called tyrants, but mainly because the first named member of this family, Eastern Kingbird, behaved tyrannically towards other birds and was called "Tyrant": www.flickr.com/photos/timmelling/54018770724/in/photolist But Cattle Tyrant is more deserving of the name as it is pugnacious, and is known for stealing nests from other birds. Its scientific name (Machetornis rixosa) even translates as quarrelsome fighting bird. The "cattle" part of its name comes from its habit of following cows around, sometimes perching on their backs, then swooping to catch flushed insects. I photographed this individual at Costanera Sur near Buenos Aries.
