Assertion: gull's plumage | /r/HasProperty | known under the humphrey–parkes system
Facets:
value: as " alternate " plumages
type: OTHER
Source sentences:
text: Plumage is regularly moulted; the standard plumage of a bird that has moulted after breeding is known as the " non-breeding " plumage, or—in the Humphrey–Parkes terminology—"basic" plumage; breeding plumages or variations of the basic plumage are known under the Humphrey–Parkes system as " alternate " plumages.