Triceratops epoccipitals

[Nick <nick.gardner@gmail.com>]

I was just recently skimming over Goodwin and Horner's paper from last
year, and I was curious after reading the section on ontogeny and
epoccipitals. After spending a short time talking about it with
Mickey, I thought posting a query to the DML might not be a bad idea.

Does anyone know of similar cases in nature where pointed triangular
shaped edges change to low and rounded edges as the animal matures and
why it might happen? I don't think "wear-and-tear" is necessarily the
best explanation for this..