How do sea molluscs create the consistent patterns on their shells? How do they know when and how to change the pigment?

Every collection needs a "gotta have it" bucket list. Stamps. Coins. Baseball cards. Comic books. Movie posters. Yes, even seashells.

An expert from the Bailey-Matthews National Shell Museum has compiled a list of rare shells found in Florida. The popular and rare Junonia shell was intentionally excluded from this particular list. A ...