Triceratops

Period: the late cretaceous - 65 milion years ago
Where: North America (Colorado, Montana, South Dakota, Wyoming, Alberta, Saskatchewan)
Fossil dimension: 7,5 meters long, 2,9 meters high
Quick facts: Despite appearances, Triceratops was no gentle, plant-eating giant. Many fossil records show damage to triceratops bones that could have occurred in combat with rivals or predators. Aside from inter-group displays of domination and as weapons, horns could have also been used in mating displayes. The neck frill would have offered some protection against predatory bites and may have regulated body temperature.