True the animal had a bite or some such on the tail, but it didn't die
because of it. Would this mean T. rex was a bad hunter because the prey got
away?
No. Based on living predators, a success rate of 33% would be very good,
and succeeding more than half of the time would be truly remarkable. Only
one predator I know of ever manages much better than that (and even there,
only the most skilled individuals reach those levels).
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May the peace of God be with you. sarima@ix.netcom.com