Ankylosaurs first appeared during the early
and survived until the
end of the
about 65 million years ago, when all the remaining non-avian
All Ankylosaurs were herbivores (plant-eaters),
quadrupedal (walking on four legs),
and protected by armor. Although the amount of armor
did differ between species. The Ankylosaurs are principally divided into
two families - the Ankylosauridae and the Nodosauridae -
the big difference between that most (but not all) of the former have
bony clubs in their tails, whereas none of the latter family where equipped
with such clubs. Recent research has however added one additional family,
Scelidosauridae to the Ankylosaurs - this group currently
contains only two early and primitive armored dinosaurs:
Bienosaurus and Scelidosaurus.
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