Triceratops’ enormous head might have been all it took to send other dinosaurs running—some recovered skulls measure up to 10 feet long. Its head was ornamented with three horns, a short one ...

The 150-million-year-old Apex fossil is thought to be one of the largest and most complete Stegosaurus skeletons ever found.

Members of the Triceratops genus were large, quadrupedal herbivores that weighed somewhere between 12,000 and 20,000 pounds.

Though Leptoceratops was 6 to 9 feet (2 to 2.7 meters ... common in its more advanced and better-known relatives, such as Triceratops. As an individual, Leptoceratops, a smallish herbivore ...