From Norman, Okla., at a meeting of the Society of Vertebrate Paleontology
Scientists say that a bathtub-shape depression found at one of North America’s most significant sites of dinosaur tracks is the first recognized evidence of urination in dinosaurs.
The Purgatoire Tracksite south of La Junta, Colo., boasts more than 1,300 fossil footprints that form more than 100 individual trackways.
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