Museum IDs New Species of Dinosaur

This two image combination provided Saturday, March 3, 2007 by the Cleveland Museum of Natural History shows, at top, a photo of the skull of the new horned dinosaur, Albertaceratops nesmoi, and at bottom, an artist's reconstruction of the skull. Michael Ryan, curator of vertebrate paleontology for the Cleveland Museum of Natural History, published the discovery of the dinosaur in the March 2007 Journal of Paleontology. He dug up the fossil six years ago in southern Alberta, Canada, while a graduate student for the University of Calgary. (AP Photo/Cleveland Museum of Natural History, artist\'s rendering by Donna Sloan/Royal Tyrrell Museum of Paleontology, photo courtesy Michael J Ryan and the RTMP)

(AP) -- A new dinosaur species was a plant-eater with yard-long horns over its eyebrows, suggesting an evolutionary middle step between older dinosaurs with even larger horns and the small-horned creatures that followed, experts said.