A scale model of Baluchitherium aka Paraceratherium It was an early relative of the rhinoceros which lived in Asia about 20 - 30 mya, and was possibly the largest land animal ever to have lived. (photo: Neil Kelly)
Nevada Indian legend of 12 foot red-haired giants that lived in the area when they arrived. The story has the Native American's killing off the giants at a cave. Excavations of guano in 1911 turned up this human jaw. Here it is compared to a casting of a normal man's jawbone. In 1931 two skeletons were found in a lake bed. One was 8' tall, the other just under 10' tall.
Skull of Barbourofelis, extinct carnivorous mammals which lived during the Miocene (15 to 6 mio years ago) in North America. The appearance of this predator reminded very much the saber-toothed tigers. The structure of the barbourofelis was very strong: it might look like a lion with the physique of a bear or a bear with the head of a lion.
Spinosaurus: Pending further discoveries, Spinosaurus is the current record-holder in the "world's largest carnivorous dinosaur" category: full-grown adults outweighed Tyrannosaurus Rex by about a ton and Giganotosaurus by about half a ton. Since so few Spinosaurus fossils are extant, it's possible that other individuals were even larger!