What exception to typical migratory patterns is observed in the Wood Duck population using the Pacific Flyway?

Answer

Roughly three-quarters of the Wood Ducks remain non-migratory year-round

While it is generally true that northern Wood Duck populations migrate south to escape harsh winter conditions, the Pacific Flyway presents a significant deviation from this rule. Within this specific migratory corridor, a substantial majority of the Wood Ducks—approximately seventy-five percent—do not engage in seasonal migration. These individuals establish residency year-round along the West Coast regions, contrasting with the more migratory tendencies seen in populations further north or those utilizing the Atlantic and Gulf Flyways.

What exception to typical migratory patterns is observed in the Wood Duck population using the Pacific Flyway?
locationbirdwildlifewood duck