The Ceratopsia (meaning "horned faces")
are an infraorder of herbivorous (plant-eating) dinosaurs, that
were characterized by having beaks.
Early members of this infraorder, such as
were bipedal (walking on two legs).
Later Ceratopsians tended to be much larger and quadrupedal (walking on
four legs), often had elaborate neck frills and facial horns,
and included dinosaurs such as
The Ceratopsia infraorder, together with the infraorders of
Pachycephalosauria ("thick-headed lizards")
Ornithopoda ("bird feet"),
form the the suborder Cerapoda of the
Ceratopsians are sometimes grouped together with
as the Marginocephalia ("fringed heads"), since the
these two infraorders share some common features and appear to be related.
The skull of Ceratopsians is the most common part of
the animal to be preserved as a
(in contrast to other dinosaurs, where the skulls are often not found).
Indeed, a number of species of Ceratopsians are known only from
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