Before they were overthrown by the wyvernidae which came from the north, lophoraptorids were extremly successful. During the early miocene they were still in conflict with the terror birds, species like Kelenken and Phorusracos stood at the front of an evolutionary battle (that would be a very interesting theme for the show "Mega Beasts"
) but at the end of the Miocene only big crocodiles like Purussaurus were a danger for adult dragons. Here you see the biggest species of all time. Terrorlophosaurus (4 m), Palalophoraptor (4,6 m) and Boroepula (5,2 m)
Above this you can see a small portrait series of Ascialophoraptor, a relative of Terrorlophosaurus but somewhat smaller.