Spinosaurus
Spinosaurus was larger than Tyrannosaurus. Estimates published in 2005, 2007, and 2008 suggested that it was between 15 metres (50 ft) in length and 7 to 20.9 tonnes (7.7 to 23.0 short tons) in weight. A new estimate published in 2014 and based on a more complete specimen, supported the earlier research, finding that Spinosaurus could reach lengths of over 15 m (49 ft). It had a two meter high sail on its back like Dimetrodon. Several uses have been suggested for this sail, such as to help control its body temperature, as a way to attract a mate, and to intimidate or frighten enemies. It lived in what is now the Sahara Desert, but which then was mangrove forests alongside shoreline conditions, tidal flats and channels.