I sopke to Ray Harryhausen about this film and he told me Gwangi (lizard in Spanish) is actually a Tyrannosaurs / Allosaurus hybrid.
The Valley of Gwangi
Time Out saysA Charles Schneer/Ray Harryhausen fantasy for Dynamation special effects fans only: a reworking of the King Kong structure that has turn-of-the-century Wild West show boss Franciscus venturing into Mexico's Forbidden Valley in search of prehistoric specimens. A formula writing credit for William Bast, one of the very few screenwriters to have been characterised on screen: by Michael Brandon in the telemovie James Dean, which tracked the friendship between the actor and Bast from UCLA to Dean's death.
Cast and crew
<strong>Rating: </strong><span class='lf-avgRating'>0</span>/5