Assertion: black footed ferret | /r/CapableOf | have migrated to north america
Facets:
value: from siberia
type: TRANSITIVE-OBJECT
value: across the bearing land bridge
type: LOCATION
Source sentences:
text: During the late Pleistocene (maybe 100,000 years ago) black-footed ferrets are thought to have migrated to north America from Siberia across the bearing land bridge while all of the water that is now the ocean was suspended as ice.