no they are each unique and special like a snowflake. (exit gay mode)
but i did find this
Quack can refer to:
* the noise made by several species of duck
* a person who practices quackery, i.e., an impostor who claims to have qualifications to practice medicine
* couch-grass or quack-grass, Elymus repens, synonyms: Agropyron repens, Triticum repens
* Quack (comics), an independent-comics series published by Star Reach in the 1970s.
WoW! thx wiki!