The huge Brachiosaurus can be seen from far and wide: As high as a house, its long neck juts out above the treetops. What is it doing there anyway? With its sharp teeth, it plucks leaves and twigs from the branches. It's rarely disturbed during mealtimes, and not just because of its size. The prehistoric giant is covered from head to the tip of its tail in fiery red lizard skin. It's a clever way for the Brachiosaurus to keep attackers at bay. But, as a vegetarian, it's not usually in the mood for a fight.