In answer to your question....how was the scene involving the giant lizards or Dimetradons as they are called in the movie done.Indeed this was a tricky piece of film making to do back in 1959 however the lizards were of a very small size,the film makers effects team attached added fins and spines to each lizard and as the actual lizards themselves were of a very dosile nature they seemed not to mind this being done at all,as to the scene of the other lizards attacking the doomed victim from Hans the guides spear,the filmakers shot the sequence with a single lizard seperately and with the aid of clever film editing gave the effect that the lizard had indeed been speared through the mouth,now finally as for the other lizards attacking the now dead lizard now lying on its side dead from being speared,no the lizard lying on its side is not really the real lizard but a incredible piece of then rubber and foam puppet,and lets be honest it looks pretty damn real lying there,to intice the other lizards to attack the puppet as if it were food the filmmakers did just that,stuffed the puppet with raw meat,the smell alone was enough to entice the other lizards to think it was tea time,then ofcourse the final shot of the explorers dragging the raft past the creatures as they stood guard over their feast was matted into the shot.
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