The Ornithopoda (meaning "bird feet")
are an infraorder of herbivorous (plant-eating) dinosaurs.
Early members of this infraorder were small bipedal (walking on two legs)
Later Ornithopods were often much larger and at least partially
quadrupedal (walking on
four legs). As a group they were very successful, especially the
duck-bills (Hadrosaurs), it seems principally as a result their
evolution of sophisticated chewing apparatus.
The name Ornithopoda, refers to the animals feet, which in
later species were three-toed (earlier species often had four toes),
and outwardly tended to resemble those of birds (although the
Ornithopoda are not closely related to birds).
Ornithopods first appeared during the
perhaps around 200 million years ago,
and survived until the
end of the
Ornithopods were among the dinosaurs
which died out during the
of 65 million years ago.
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