This primate snake has a horn on its head which has metallic components to strengthen the bone. The spikes that go down along the tail are also composed partly of metal.
The armour on the tail restricts upward movement, so that's why they still (ie. evolution hasn't gotten rid of them) have legs to be able to push themselves upward. They have very stiff necks. Their teeth can move individually, as well as having a jaw movement.
Their brain capacity is very low, so they weren't the smartest of creatures. They lived from about 100 million years ago to 55 million years ago. They died out from exposure. They survived the KT, but they died when the rainforests started to disappear and give way to desert.
They spent most of their time in water, because that's where their huge bodies could fit.
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