Tooth enamel isotopes indicate that the species was a grassland herbivore that drank from various water sources

aethiopicus 'Pointed lizard') is a genus of small stegosaurid dinosaur from the Kimmeridgian Age of the Upper Jurassic with a herbivorous

which they may have used for hunting or defense

Scale 1:20 - 115 mm

Acrocanthosaurus atokensis Acrocanthosaurus Tooth enamel isotopes indicate thatAcrocanthosaurus atokensis is the only known species of the extinct genus Acrocanthosaurus, a carcharodontosaurid theropod dinosaur that inhabited North America during the Cretaceous period, approximately 125 to 99. 6 million years ago. It stands out for the tall neural spines on many of its vertebrae, which suggest the presence of a kind of "hump" on its neck, back and hips. It was one of the largest theropods, with a length of up to 11. 5 meters and