Assertion: duck's population | /r/CapableOf | become established in the past
Facets:
value: temporarily
type: TEMPORAL
Source sentences:
text: They are also popular, due to their attractive plumage, in waterfowl collections and as such are frequently recorded in Great Britain as escapes—populations have become temporarily established in Surrey in the past but are not considered to be self-sustaining in the fashion of the closely related Mandarin duck.[citation needed]