I missed hearing about this when it was first dug up. I don't know why the reconstructed spines have those ripples. One thing I'm pretty sure of--they didn't use those spines for sparring with each other--snag and tangle. Since their fronts were so spiky, I wonder what protections they had on the other end?
I love what Google translate did with the last phrase: "les épines devaient être protégées par une corne ou de la peau pour ne pas se casser." ==> "They are devaient because they are protected by a cornea or by a surgeon." (the spines were protected reinforced? by horn or skin to keep them from breaking)
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