Monodon monoceros, narwhal tusk Pteranodon Lystrosaurus was by far the

Lystrosaurus was by far the most common terrestrial vertebrate of the Early Triassic

They are found singularly or in large groupings

Acheroraptor is an extinct genus of dromaeosaurid theropod dinosaur known from the Hell Creek Formation of Montana

if carefully prepared

This replica skull is from a juvenile Lambeosaurus

Monodon monoceros, narwhal tusk Pteranodon Lystrosaurus was by far theThe narwhal, or narwhale (Monodon monoceros), is a medium sized toothed whale and possesses a large "tusk" from a protruding canine tooth. It lives year round in the Arctic waters around Greenland, Canada, and Russia. It is one of two living species of whale in the Monodontidae family, along with the beluga whale. The narwhal males are distinguished by a long, straight, helical tusk, which is an elongated upper left canine. The narwhal was one of many