Laga soo bilaabo markii la ogaaday qaybinta caddaymaha qadiimiga ah, waxay u muuqataa in baalalku ay ahaayeen astaamo dinosauri ah oo awoowayaal ah, inkasta oo laga yaabo inay si xushmad leh u lumiyeen noocyada qaarkood. Caddaynta tooska ah ee baalal ama qaababka baalal-sidaha ah ayaa laga helay noocyo kala duwan oo noocyo kala duwan ah oo ka mid ah kooxaha dinosaur-ka aan shimbiraha ahayn, labadaba saurischians iyo ornithischians. Qaab-dhismeedka fudud, laamiga, baalal-sidaha ah waxaa laga yaqaan heterodontosaurids, neithischians iyo theropods, iyo ceratopsians.
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