Assertion: blue headed vireo | /r/HasProperty | lumped in 1950
Facets:
value: into a single species
type: OTHER
Source sentences:
text: Though it had been previously classified as a separate species, the blue-headed vireo along with the plumbeous vireo (Vireo plumbeus) and the Cassin's Vireo (V. cassinii) were lumped in the 1950s into a single species, based on morphological data.