T. rex is as big as the largest known African elephant, and Brachiosaurus, like other great sauropods, was much larger than any land animal alive today.

• 霸王龙就和目前所知最大的非洲象一样庞大，腕龙则与其他蜥脚类恐龙一样，比任何一种现存的陆生动物都要大上许多。