Autosexing

Females typically have a dark, sharp "chipmunk" stripe; males are paler and often have a diffuse white spot on their heads.

Result from crossing two different breeds (e.g., a Rhode Island Red rooster and a Delaware hen). Their offspring will not breed true; if you mate two sex-links, the next generation will lose the predictable color markers. Performance Benefits autosexing

While both allow for easy sorting, they are genetically distinct: Females typically have a dark, sharp "chipmunk" stripe;