Amargasaurus

Trample, Reach
Both the function and the appearance in life of the extremely elongated and bifurcated vertebral spines remain elusive.Salgado and Bonaparte suggested the spines represented defense weapons against predators, arguing that they tapered towards their tips. In a subsequent skeletal reconstruction drawing, Salgado depicted the neural spines supporting a keratinous sheath, which could have added significantly to the total length of the spines.