Another incredibly famous dinosaur, triceratops is most well-known for its thick, bulky body and the unique facial features it possesses, including the three large white horns that adorn its face. These are similar to the horns of the modern rhinoceros, which is believed to have the triceratops as a very distant ancestor. The dinosaur's name 'Triceratops' originates from Greek dialect, with 'tri' translating to three and 'keratops' which means horned face. The triceratops was a herbivorous, which means that it ate only plants and therefore never killed any other dinosaurs to consume. It required its three horns to attempt and shield itself from the Tyrannosaurus Rex, its main predator, which lived during the same time period. Not many other carnivores had a sharp enough bite to penetrate the skin of the three-horned dinosaur, but tyrannosaurus rex's colossal jaw and massive bite force allowed it to easily. Two of the horns were significantly larger and made of a different nateral than the third, less important horn that was positioned underneath and in front of the other two. The very first known fossils to confirmed to be that of a Triceratops were horns connected to a portion of a skull, found close to Denver, Colorado back in 1887. Triceratops had somewhere in the range of 400 to 800 teeth, although only a small amount of these were being used at any one time as they were continually replaced all through the entirety of its lifetime. Some portion of what makes Triceratops such an unmistakable dinosaur is the huge size of its skull, which, with its large, decorative frill that extended in every direction around its neck, could often achieve a length of more than seven feet. Extraordinarily, the skulls of different precursors and relatives to the triceratops, for example, Centrosaurus and Styracosaurus, were much more massive in size and even more intricate. This fact is no doubt an aftereffect of sexual selection, as male triceratops with larger heads were more appealing to females amid the dinosaur's mating season, and consequently would pass along this characteristic to the children they had. A little-known fact is that triceratops had a rather sharp and hard beak similar to that of modern birds. The dinosaur used this physical advantage to slice through and consume many pounds of hard-to-get-through and tough vegetation in order to get the nutrients it needed. The ancestors of the triceratops were often significantly smaller than what we now know as the triceratops: many of them were the size of a domesticated cat and only weighed around thirty or forty pounds, in intense contrast with the nine or ten foot tall, 13 to 26 thousand pound massive beasts that are so recognizable and menacing. Triceratops is believed to have lived up until the extinction of all dinosaurs occurred, meaning that it roamed the earth for a long amount of time and could have easily gone longer, until its life was sadly destroyed by the mass extinction.