Wikipedia:Today's featured article/March 26, 2011

Acrocanthosaurus is a genus of theropod dinosaur that existed in what is now North America during the Aptian and early Albian stages of the Early Cretaceous. Like most dinosaur genera, Acrocanthosaurus contains only a single species, A. atokensis. Its fossil remains are found mainly in the U.S. states of Oklahoma and Texas, although teeth attributed to Acrocanthosaurus have been found as far east as Maryland. Acrocanthosaurus was a bipedal predator, best known for the high neural spines on many of its vertebrae, which most likely supported a ridge of muscle over the animal's neck, back and hips. Approaching 12 meters (40 ft) in length, and weighing up to 6.17 metric tons (6.8 short tons), it was the largest theropod in its ecosystem and likely an apex predator, possibly preying on large sauropods and ornithopods. (more...)