An inherited practical feature needs reliable breeding continuity

The British Waterfowl Association links the modern Pilgrim's development and standardization with Oscar Grow. Its account emphasizes authentic parent stock because the useful sex-linked color can be disrupted through crossing. This is a stronger explanation than simply calling any white male and gray female a Pilgrim pair.

The page describes subtle gray traces on the male and increased white around a female's eyes with age. Age and sex therefore matter when comparing photographs. These observations also help explain why one picture cannot capture all expected appearances.

Production and temperament descriptions on the page are qualified by strain and early handling. They are useful context, not universal predictions. A learning library should connect the recognizable color system with continuity of the population and identify which observations concern a particular strain or husbandry setting.