You've got to admire any dinosaur whose name translates as "big enigmatic lizard"—a view apparently shared by the producers of the BBC series "Walking with Dinosaurs," who once gave Macrogryphosaurus a small cameo. One of the rare ornithopods to be discovered in South America, Macrogryphosaurus seems to have been closely related to the equally obscure Talenkauen and is classified as a "basal" iguanodont. Since the type fossil is of a juvenile, no one is quite sure how big Macrogryphosaurus adults were, although three or four tons is not out of the question. You are searching for a small lock n lock at a two trunked tree.