Assertion: hummingbird | /r/HasProperty | the jungornithidae
Facets:
Source sentences:
text: Fossils of birds not clearly assignable to either hummingbirds or a related, extinct family, the Jungornithidae, have been found at the Messel pit and in the Caucasus, dating from 40–35 mya; this indicates that the split between these two lineages indeed occurred at that date.