Original: On his journey, he meets four young companions: Cera, a Three-Horn (Triceratops); Ducky, a Big Mouth (Saurolophus); Petrie, a Flyer (Pteranodon); and Spike, a Spike-Tail (Stegosaurus).
Simplified: Cera: Cera is a "three-horn," also known as a Triceratops.