The frill could have been used for defense or possibly to help in mating. The horridus are always found in ground below the prorsus, so they are older. The horridus have a smaller nose horn and larger beak than the prorsus.
eBay
Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
eBay
We are happy to help you. Your Fantasy Specialist since 2003. 1 month cancellation period. - Material: artificial stone. Magic & Witchcraft. Other Interior.
eBay
Most likely the lower jaw section. Back of the piece has been stabilized to prevent breakage. This nice size section of the jaw has no restoration and exemplifies how most cretaceous bones are found in the field.
eBay
This piece has the typical rib shape. It also has a bit of trabecular pattern on the inside. A nice addition to anyone's dinosaur bone collection.
eBay
Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
eBay
The two long horns above the eyes were its most formidable defensive features, while the smaller nasal horn extended from the snout. Late Cretaceous, 66-68 million years old. The item pictured is the one you will receive.
eBay
This suggests a large and successful population. They were characterized by their large frill, three horns (two long brow horns and a smaller nasal horn), and a powerful beak and jaws. The frill may have had various functions, including display, protection, and possibly thermoregulation.
eBay