What discovery shows a relationship between dinosaurs in the Northern and Southern Hemispheres?
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The discovery of the foot of Araucanoraptor argentynus in Neuquen, Argentina, is another piece of evidence that dinosaurs migrated into the Southern Hemisphere and were, therefore, related to those found in the Northern Hemisphere. This particular dinosaur was a 90 million-year-old theropod originally thought to have never made it to the Southern Hemisphere. For a long time, paleontologists believed that dinosaurs from the Northern Hemisphere were completely different than those found in the Southern Hemisphere. Fossil finds like those of Araucanoraptor argentynus show that they were indeed related. In fact, Araucanoraptor argentynus was related to the Troodon, whose fossil remains have been found in Canada.