 These publications have framed Mr. Ford's hypothesis as if it were a new idea and a subject of debate among paleontologists, when the idea of aquatic dinosaurs was considered nearly a century ago, and rejected after careful research forty years ago.When challenged by paleontologists, Ford presented a summary of recent findings, concluding that "Spinosaurus" was clearly aquatic, a finding later confirmed by paleontologists at the University of Chicago.Ford claimed that only an aquatic lifestyle could account for the fact that the tails left no marks in trackways, and thus were buoyant, that many of their bones contained air-sacs, that the controversy over endothermy was solved through the buffering of a watery environment, and that so many skeletons were found in alluvial deposits.