Damage to the spikes on the back of a fossil of a Zuul crurivastator suggest that these armoured dinosaurs didn’t use their tail clubs to fend off Tyrannosaurs but to fight each other
“Big, predatory dinosaurs can bite with enough force to leave scratches and puncture marks on bone,” says Arbour. But these marks are missing on this fossil.
Based on the damaged spikes being at different stages of healing, and in a location both easily reachable by anotherswinging tail and unlikely to be fatal, the researchers believe the dinosaurs used their tails to fight each other for social dominance. They suspect it was similar to the way modern animals useor other body parts to stake claim to territory or mates.
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