You are in the forests of South America, 125 million years ago.

The humid heat of the Early Cretaceous afternoon hung heavy over the riverbank, where you crouched, keeping low in the ferns. What emerged from the tree line made your heart stop for a different reason.

It wasn’t the massive size of a Brachiosaurus, but something far more intimidating. An Amargasaurus stepped into the clearing, its skin a mottled dark green and beige. What truly stole your breath were the twin rows of foot-long spines running from its head down to its shoulders. The sun caught the keratin covering of the spikes, making them appear almost golden.