One of the most remarkable and distinctive features of Spinosaurus fossils, the one that inspired its name are the large spines on its back. These grew on its vertebrae to a length of more than 5 feet (1.6 meters). The spines are thought to have been covered with skin forming a "fin" or "sail", although some scientists have suggested that they may actually have been covered in fat and formed a "hump".
The precise purpose of the fin, sail or hump remains unclear, but some suggestions include:
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