The native animals will attack the Nanosaur when their eggs are threatened; species encountered include Tyrannosaurus Rex, Stegosaurus, Triceratops, Dilophosaurus (who spits like in Jurassic Park), and the flying reptile Pteranodon.
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After making his way across the river, the Nanosaur detects the final eggs in a canyon oasis, where various dinosaurs, namely Dilophosaurus and Stegosaurus, are attempting to hinder his progress in order to protect their eggs.