Assertion: nightingale's plumage | /r/RelatedTo | higher breeding success
Facets:
value: in some populations
type: LOCATION
value: like in the subspecies
type: OTHER
Source sentences:
text: Plumage may be used to advertise: in some populations, like in the subspecies H. r. gutturalis, darker ventral plumage in males is associated with higher breeding success.