Labels:text | animal OCR: JURASSIC (208-144 MYA) FOSSIL FINDS Mamenchisaurus, a long, four-legged plant-eater with a blunt snout, strong teeth, and the longest known neck of all dinosaurs. Tuojiangosaurus, a four-legged plant-eater with a low head, two rows of protective plates from neck to tail, and spikes at the tip of its tail.