Here's part 3! Of all the creatures in the sauropod family, Amargasaurus titanicus is likely the most unique in appearance. It sports two parallel rows of dorsal spines down the length of its neck, back, and tail--though the neck spines are significantly longer than the back of tail spines. These spines are a remarkable adaptation, giving Amargasaurus unmatched control of its body temperature. Made even more marvelous by their time on this ARK, their spines store both extreme heat AND extreme cold, effectively allowing Amargasaurus to live comfortably in any environment. It's sails also make it an abnormally capable swimmer, for a sauropod. Unlike most sauropods, Amargasaurus is very prone to violent aggression, attacking most predators (and humans!) on sight. I suspect this behavior developed alongside the dangerous spines it uses as weapons.