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Post by Anomonyous on Jul 9, 2012 18:18:13 GMT -5
One piece of evidence though for the robust morph being female is that several of them have healed hip injuries, which Larson attributed to mating. How would mating lead to broken hips? This could be attributed to fights with other Tyrannosauruses. Being larger could mean more serious competition (a smaller specimen will probably run away the majority of times) and more fights. IIRC, Tyrannosaurus did occasionally go for the hip to disable prey items...perhaps this would have carried to fighting. I have no idea, but perhaps a larger pelvis would also be more susceptible to injury. Think again! In many bird species, the females are larger than the males. Bald eagle females are 10-25% larger than males. Most flightless birds however have larger males than females or equal sizes for both, as do crocodilians. These are likely to be Tyrannosaurus' closest modern descendants.
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