A paleontology student was our guide at the T.rex Discovery Centre,
A very knowledgeable and all around nice guy who loves what he does.
Here he is showing us a healed over bone on a Triceratops.
Speculation is it was likely broken off by an attack by a Tyrannosaurus Rex.
Worth the time to visit and we saw Scotty too! (A very large T Rex)

T.rex Discovery Centre in Eastend, Saskatchewan