Most horns on an animal ever

The most horns on an animal ever is 15, as borne by the prehistoric ceratopsian (horned) dinosaur Kosmoceratops richardsoni, which lived approximately 76 million years ago during the Late Cretaceous in the southern region of what is now the state of Utah in the USA. It bore 10 spiky horns (eight of which were hooked) around the fringe of its bony frill protecting its neck, plus a long thin pointed horn above each eye, a shorter, less pointed horn extending from each facial cheek, and a single squat blunt horn upon its nasal bones. More famous but less "horny" ceratopsian dinosaurs include Triceratops, Protoceratops and Styracosaurus.

Whereas the horns of horned mammals such as antelopes, sheep, goats and cattle are composed of keratin (the same substance that hair, nails and hooves are also made of) covering a live bony core, those of Kosmoceratops and other ceratopsian dinosaurs were made of solid bone, and constitute extensions of the specific facial cranial bones bearing them or the bony neck-protecting frill bearing them (the frill itself consisting of the rearward extension of the squamosal and parietal cranial bones).

Kosmoceratops richardsoni was formally described and named in 2010, honouring a palaeontological volunteer, Scott Richardson, who discovered two skulls belonging to this species. It is the only member of its genus, Kosmoceratops, which translates as "ornate horned-face".