AN ENORMOUSLY SUCCESSFUL SUBGROUP of the Saurischia,
the bipedal (two-footed) theropods (“beast feet”) emerged
230 million years ago in Late Triassic times; the oldest known
Example comes from South America.
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| Fossil Skeleton of Archaeopteryx |
Theropods spanned the age of
most dinosaurs (230-65 million years ago) and beyond, and included
most of the known predatory dinosaurs. The typical theropod had smallish
arms with sharp teeth; an S-shaped neck; long, muscular hind limbs;
and clawed, usually four-toed feet. Many theropods may have been
warm-blooded; most were exclusively carnivorous. Theropods ranged
from Tyrannosaurus and Baryonyx. The group also included
ostrich-like omnivorous and herbivores with toothless breaks,
such as Struthiomimus and Gallimimus. Birds are dinosaurs and evolved
from within a group of tetanuran theropods called maniraptorans.
Archaeopteryx, small and feathered, was the first known bird and lived
Alongside other Dinosaurs.
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