The Maiasaura Patriarch is the unnamed-leader of the Maiasaura herd.
Like all the Maiasaura he doesn't look like a real hadrosaur, but does have a cone-shaped horn on his head and a vertebral-ridge. For color he is a beige with dark-purple spots. He also has closed-slits for eyes.
He is very-protective of his herd, and doesn't trust carnivores one bit: even infantile ones are considered a threat in his eyes, which is why he tried to murder Heart. He does seem to care about Mother Maiasaura though, despite leaving her behind on their migration when she chose Heart over them, as when they reunite he actually thought she would want to come back, though he didn't seem disappointed that she refused (and accepts Light without question).