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In addition to the purely fictionalized fleshy neck frill, poison glands,
and the abilitiy to spit, Michael Crichton gave Dilophosaurus (or was it
Procompsognathus?) a forked tongue, which supposadly had scent receptors
on it. As far as I am aware, the only animals with forked tongues are
varanoid lizards and their close relatives. Dinosaurs are archosaurs, as
are crocs. and birds; so a best guess is that dinosaurs had solid, slender
tongues like birds.