Acrocanthosaurus (ak-row-KANTH-uh-SAWR-us)
A bipedal theropod from the Early Cretaceous of Oklahoma, Texas and Utah, USA.
It had a big head (1.4 m) and 68 thin, sharp, serrated teeth. It had 43 cm long spikes
extending from its vertebrae along the neck and tail that may have formed a thick,
fleshy sail on its back. It had powerful arms and each hands had three fingers,
each equipped with long, sickle-like claws.
[Greek akro, "high" + akantha, "spine"].
Length: 9-12 m
Weight: 2-3,5 tonnes