Assertion: wishbone | /r/HasProperty | unique
Facets:
value: to birds
type: TRANSITIVE-OBJECT
Source sentences:
text: Although today the wishbone is unique to birds, it first appeared in early non-flying dinosaurs.
text: The wishbone, more formally known as the furcula, is a feature that is unique to birds.
text: The Y-shaped furcula, or wishbone as normal folks call it, is unique to birds, and breaking it to determine who gets the larger of the two halves – and thus the wish or good luck – goes back a few thousand years.