De acordo com a Wookieepedia , que cita A Enciclopédia Completa de Star Wars , a evolução existe no universo de Star Wars:
In the The Complete Star Wars Encyclopedia, gizka are referred to as a "fish" which was prized by the Selkath of Manaan rather than a reptilian species. The species, according to the encyclopedia, is said to have possibly evolved from a more rabid native on Lehon about four millennia prior to the Galactic Civil War.