What ever happened (evolutionarily) to the spikes on the stegasaurus tail?
Any living reptiles have weapons on their tails? Are there any other dinosaurs that used to have them? Seems weird that there doesn’t exist a whole evolutionary line of reptiles with spiky tails. I mean carrying that weight around is a pretty serious cost. For those things to have grown stega-size, they must have been around for a long time on stega-ancestors, no?
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