Difference is sometimes unwelcome. A person who wants to be different by not following the group and doing there own thing in could be looked down upon. To keep people in line, threats could be made explicit and implicit about the negative effect of leaving the group.
Believe it or not, lobster and crabs are crustaceans and are a part of the arthropod family, which include caterpillars, cockroaches, and spiders!
A Galactic Funking Hunt Wit Not Wont