Chipmunk or Dinosaur?

My friends, Lane and Courtney, are getting married, and I had the honor of designing the postcard invitation for the rehearsal dinner. The card was part of a set of custom-designed postcards --one for each event-- designed especially for Lane & Courtney by a few of their design-y friends. The only criteria: it had to have something to do with Lane & Courtney.

My card refers to Lane's own special classification of feminine beauty into two categories: chipmunk or dinosaur. Don't bother trying to understand it. I've been trying for a while now, via interviews and numerous examples, but to no avail. I'm a dinosaur. So is Courtney. The quintessential dinosaur is Sarah Jessica Parker. Go figure.