Original sentence: This is larger than even the largest known terrestrial carnivore, Spinosaurus, which reached at least 16-17 meters (53-56 ft) in length and 9 tons in mass
Edited sentence: This is larger than even the largest known terrestrial carnivore, Spinosaurus, which reached at least 16-17 meters (53-56 ft) in length and 9 tons in mass (it should be noted that this is only an estimite since no skelaton has been found sice WWII)