Amargasaurus (Desktop model by Favorite Co. Ltd.)
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Most sauropods tend to more or less look similar; big body, long neck long tail. Rarely will a sauropod possess any distinguishing characteristics beyond those three things. Then there is Amargasaurus. This dinosaur was a smaller (relatively speaking) sauropod from the early Cretaceous in what is now Argentina. It is highly distinguishable amongst other dinosaurs by the double row of tall spines that run down the back of its neck.