During the jurassic and Cretaceous periods, dinosaurs have undergone a transition from marine animals to terrestrial animals. During this period, the earth's climate was warm and humid and abundant in food, which provided excellent conditions for the survival of dinosaur families. More and more powerful. in order to thrive and survive, the dinosaur society also began to feed on the weak. At this time, a little dlnosaur was forced to the clif, and his life was at stake. Now ask the children to complete this puzzle, and ask the Triceratops drinking water by the river to rescue the little dinosaur.