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Therizinosaur beaks and cheeks
In response to a posted query
Because therizinosaurs (alias segnosaurs) may have descended from beaked
theropods like oviraptors, and had a suitable premax, they very probably had
fully developed beaks. Exactly how extensive. Sans time travel, we'll
probably never know.
The upper and lower tooth rows are inset along their entire length, so cheeks
are strongly indicated. It was argued otherwise in The Dinosauria 1990, but
this view does not appear logical.